diff --git a/docs/pi-support-restructure-zh.md b/docs/pi-support-restructure-zh.md
index aa6fc019f..6e464720e 100644
--- a/docs/pi-support-restructure-zh.md
+++ b/docs/pi-support-restructure-zh.md
@@ -50,6 +50,30 @@
 
 > 文档考据说明:修正案 1/2(`pi-support-contracts-amendment-*.md`)的条款已按其自身要求**合并**进 `pi-support-contracts-zh.md` 与 `pi-support-review-contract-zh.md`,独立文件已随合并删除,这是预期状态而非丢失;本文引用的"修正案 2 §F/E1"以合并后的规范文档对应章节为准。
 
+## 4.7 协议放宽:契约纲领化(用户裁决,2026-08-02,优先于 §2、§4)
+
+自本条起,**所有后续契约以纲领为主**:只给目标与验收标准,实现方(编码 Codex)
+获得相当大的自由度。§2"测试先行 + 冻结认证套件"的重仪式**不再默认适用**。
+
+**保留的最小规则**(全部有实证代价支撑,不是仪式):
+
+1. **既有测试不得弱化**:测试总数只增不减,盲审核对;
+2. **冻结物不动**:pinned 夹具、已重冻的 infra 三文件、restore 面;
+3. **行为主张须有证据**:凡断言"pinned Pi 如此行为",须有 oracle 或
+   request-capture 实证(`scripts/pi-transport-capture.mjs`)。此条是四轮
+   返工换来的——读源码推断先后写反过 Google header-only 契约与 authHeader 次序;
+4. **不 push、不建 PR、不动 `stash@{0}`、不碰 PR #5598**。
+
+**取消的**:精确红绿账本与"偏离即硬停止";每工程 2 轮 fresh 双审的固定配额;
+实现路径、DTO 形状、测试组织方式的规定;裁决方逐条批准。实现方自行判断何时
+完成,自行组织验证与审查,完成后报终态 SHA。
+
+**为什么放宽**:前置 A/B/C 的证据表明,重仪式的边际收益在下降而成本在上升——
+后期盲审 finding 多为"防作弊机器"的自我军备竞赛,且契约越长裁决方自身出错越多
+(表名、文件映射、虚假覆盖声称、与上游相反的契约,均为契约复杂化后的产物)。
+实现方在四个工程中零作弊记录(精确硬停、拒改认证文件、顶住 reviewer 的错误建议),
+信任已由行为挣得。
+
 ## 4.6 前置 B 终止关账(用户裁决,2026-08-02,优先于 §4.5)
 
 §4.5 的缩围执行后,重认证 R1 仍在**存量产品面**出现 3 项 High(配置目录可变
diff --git a/scripts/pi-transport-capture.mjs b/scripts/pi-transport-capture.mjs
new file mode 100644
index 000000000..aac80b77b
--- /dev/null
+++ b/scripts/pi-transport-capture.mjs
@@ -0,0 +1,259 @@
+#!/usr/bin/env node
+/**
+ * Pi transport request-capture harness.
+ *
+ * 现有的 native-oracle 只执行 pinned Pi 的 schema evaluator / composer /
+ * config-value resolver,**不执行** adapter 与厂商 SDK 的头合并,因此
+ * "Pi 实际发出什么认证头" 一直只能靠读源码推断。本脚本补上这一层:
+ * 起一个本地 HTTP 抓包端点当 baseUrl,用 pinned Pi 的 adapter 真发一次
+ * 请求,记录实际发出的 header。
+ *
+ * 用法:
+ *   PI_CHECKOUT=/path/to/pinned/pi node scripts/pi-transport-capture.mjs
+ *
+ * 不含任何密钥:测试用的 apiKey 是本地抓包用的假值;若要打真实端点,
+ * 通过环境变量传入(PI_CAPTURE_BASE_URL / PI_CAPTURE_API_KEY),不要写进文件。
+ *
+ * 输出为 JSON,可作为 transport 断言的出处依据。若要升级为受冻结的
+ * oracle 夹具,请比照 scripts/generate-pi-native-oracle.mjs 补 provenance
+ * (pinned commit、源码哈希、bundler 版本)。
+ */
+
+import { createServer } from "node:http";
+import { execFileSync } from "node:child_process";
+import { createRequire } from "node:module";
+import { mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import { join } from "node:path";
+import { pathToFileURL } from "node:url";
+
+const PI = process.env.PI_CHECKOUT;
+const EXPECTED_PI_COMMIT = "ab366ebe94cacd419d986be454f12b1b9913aaca";
+if (!PI) {
+  console.error(
+    "PI_CHECKOUT must point at a pinned Pi checkout (with node_modules).",
+  );
+  process.exit(2);
+}
+const piCommit = execFileSync("git", ["-C", PI, "rev-parse", "HEAD"], {
+  encoding: "utf8",
+}).trim();
+if (piCommit !== EXPECTED_PI_COMMIT) {
+  throw new Error(
+    `Pi checkout pin mismatch: expected ${EXPECTED_PI_COMMIT}, got ${piCommit}`,
+  );
+}
+
+const requireFromPi = createRequire(join(PI, "package.json"));
+const { buildSync, version: esbuildVersion } = requireFromPi("esbuild");
+
+const ANTHROPIC_SSE =
+  'event: message_start\ndata: {"type":"message_start","message":{"id":"m","type":"message","role":"assistant","model":"m","content":[],"stop_reason":null,"stop_sequence":null,"usage":{"input_tokens":1,"output_tokens":1}}}\n\n' +
+  'event: message_delta\ndata: {"type":"message_delta","delta":{"stop_reason":"end_turn","stop_sequence":null},"usage":{"output_tokens":1}}\n\n' +
+  'event: message_stop\ndata: {"type":"message_stop"}\n\n';
+const OPENAI_SSE =
+  'data: {"type":"response.completed","response":{"id":"r","status":"completed","output":[],"usage":{"input_tokens":1,"output_tokens":1}}}\n\n' +
+  "data: [DONE]\n\n";
+
+const captured = [];
+const server = createServer((request, response) => {
+  const chunks = [];
+  request.on("data", (chunk) => chunks.push(chunk));
+  request.on("end", () => {
+    captured.push({ url: request.url, headers: { ...request.headers } });
+    response.writeHead(200, { "content-type": "text/event-stream" });
+    response.end(request.url.includes("messages") ? ANTHROPIC_SSE : OPENAI_SSE);
+  });
+});
+await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
+const baseUrl =
+  process.env.PI_CAPTURE_BASE_URL ??
+  `http://127.0.0.1:${server.address().port}`;
+
+const harnessDirectory = mkdtempSync(join(PI, ".cc-switch-transport-capture-"));
+process.on("exit", () =>
+  rmSync(harnessDirectory, { recursive: true, force: true }),
+);
+const aiShimPath = join(harnessDirectory, "pi-ai-shim.mjs");
+const compatShimPath = join(harnessDirectory, "pi-ai-compat-shim.mjs");
+writeFileSync(
+  aiShimPath,
+  'export function lazyStream() { throw new Error("transport shim must not execute during compat capture"); }\n',
+);
+writeFileSync(
+  compatShimPath,
+  'export function getApiProvider() { throw new Error("transport shim must not execute during compat capture"); }\n',
+);
+const entryPoint = join(harnessDirectory, "entry.mjs");
+writeFileSync(
+  entryPoint,
+  [
+    `export { streamSimple as anthropicMessages } from "${PI}/packages/ai/src/api/anthropic-messages.ts";`,
+    `export { streamSimple as openaiResponses } from "${PI}/packages/ai/src/api/openai-responses.ts";`,
+    `export { streamSimple as openaiCompletions } from "${PI}/packages/ai/src/api/openai-completions.ts";`,
+    `export { composeModelProvider } from "${PI}/packages/coding-agent/src/core/provider-composer.ts";`,
+  ].join("\n"),
+);
+const bundlePath = join(harnessDirectory, "bundle.mjs");
+buildSync({
+  entryPoints: [entryPoint],
+  bundle: true,
+  platform: "node",
+  format: "esm",
+  outfile: bundlePath,
+  external: ["node:*"],
+  packages: "external",
+  alias: {
+    "@earendil-works/pi-ai": aiShimPath,
+    "@earendil-works/pi-ai/compat": compatShimPath,
+  },
+  logLevel: "silent",
+});
+const adapters = await import(pathToFileURL(bundlePath).href);
+
+const API_BY_ADAPTER = {
+  anthropicMessages: "anthropic-messages",
+  openaiResponses: "openai-responses",
+  openaiCompletions: "openai-completions",
+};
+
+/** 每个用例只改变凭证与显式 header,其余保持最小合法模型。 */
+const CASES = [
+  ["anthropicMessages", "plain-key", "sk-ant-api03-plain", {}],
+  ["anthropicMessages", "oauth-token", "sk-ant-oat01-token", {}],
+  [
+    "anthropicMessages",
+    "explicit-x-api-key",
+    "synthesized-secret",
+    { "x-api-key": "explicit-secret" },
+  ],
+  [
+    "anthropicMessages",
+    "explicit-authorization",
+    "synthesized-secret",
+    { authorization: "Bearer configured" },
+  ],
+  ["openaiResponses", "plain-key", "sk-plain", {}],
+  ["openaiResponses", "oauth-shaped-token", "sk-ant-oat01-not-anthropic", {}],
+  [
+    "openaiResponses",
+    "explicit-authorization",
+    "synthesized-secret",
+    { authorization: "Bearer configured" },
+  ],
+  [
+    "openaiCompletions",
+    "explicit-authorization",
+    "synthesized-secret",
+    { authorization: "Bearer configured" },
+  ],
+  [
+    "openaiCompletions",
+    "explicit-x-api-key",
+    "synthesized-secret",
+    { "x-api-key": "explicit-secret" },
+  ],
+];
+
+const results = [];
+for (const [adapter, label, apiKey, headers] of CASES) {
+  const model = {
+    id: "m",
+    name: "m",
+    api: API_BY_ADAPTER[adapter],
+    provider: "candidate",
+    baseUrl,
+    reasoning: false,
+    input: ["text"],
+    cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+    contextWindow: 1000,
+    maxTokens: 100,
+  };
+  const before = captured.length;
+  let error;
+  try {
+    const stream = adapters[adapter](
+      model,
+      { messages: [{ role: "user", content: "hi" }] },
+      {
+        apiKey: process.env.PI_CAPTURE_API_KEY ?? apiKey,
+        headers,
+        maxTokens: 16,
+      },
+    );
+    for await (const _event of stream) {
+      // drain
+    }
+  } catch (caught) {
+    error = String(caught);
+  }
+  const request =
+    captured.length > before ? captured[captured.length - 1] : undefined;
+  results.push({
+    adapter: API_BY_ADAPTER[adapter],
+    case: label,
+    requestSent: Boolean(request),
+    error: request ? undefined : error,
+    authHeaders: request
+      ? Object.fromEntries(
+          Object.entries(request.headers).filter(([name]) =>
+            [
+              "authorization",
+              "x-api-key",
+              "x-goog-api-key",
+              "anthropic-beta",
+              "anthropic-version",
+              "openai-beta",
+            ].includes(name),
+          ),
+        )
+      : undefined,
+  });
+}
+
+const compatInput = {
+  api: "openai-responses",
+  baseUrl: "https://compat.example/v1",
+  apiKey: "literal",
+  compat: {
+    openRouterRouting: ["first", "second"],
+    chatTemplateKwargs: "ab",
+    baseOnly: true,
+  },
+  models: [{ id: "m", compat: { supportsStore: true } }],
+  modelOverrides: {
+    m: {
+      compat: {
+        openRouterRouting: null,
+        chatTemplateKwargs: { named: true },
+        overlayOnly: true,
+      },
+    },
+  },
+};
+const compatProvider = adapters.composeModelProvider(
+  "compat-spread",
+  undefined,
+  {
+    getProvider(providerId) {
+      return providerId === "compat-spread" ? compatInput : undefined;
+    },
+  },
+  undefined,
+);
+const compatSpread = compatProvider.getModels()[0].compat;
+
+server.close();
+console.log(
+  JSON.stringify(
+    {
+      bundler: `esbuild@${esbuildVersion}`,
+      piCheckout: PI,
+      piCommit,
+      baseUrl,
+      results,
+      compatSpread,
+    },
+    null,
+    2,
+  ),
+);
diff --git a/src-tauri/Cargo.toml b/src-tauri/Cargo.toml
index e4e17bcf7..c89808a4a 100644
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@@ -23,7 +23,7 @@ test-hooks = []
 tauri-build = { version = "2.4.0", features = [] }
 
 [dependencies]
-serde_json = { version = "1.0", features = ["preserve_order"] }
+serde_json = { version = "1.0", features = ["arbitrary_precision", "preserve_order"] }
 jsonc-parser = { version = "0.33", features = ["cst", "serde_json"] }
 serde = { version = "1.0", features = ["derive"] }
 log = "0.4"
diff --git a/src-tauri/src/architecture_tests.rs b/src-tauri/src/architecture_tests.rs
index beef8776e..aad8e6788 100644
--- a/src-tauri/src/architecture_tests.rs
+++ b/src-tauri/src/architecture_tests.rs
@@ -148,22 +148,18 @@ struct ArchitectureVisitor<'a> {
     internal_edges: BTreeSet<String>,
 }
 
+fn pi_config_source_module(path: &str) -> Option<&'static str> {
+    ["raw_schema", "composer", "gateway", "native", "model"]
+        .into_iter()
+        .find(|module| {
+            let root = format!("pi_config/{module}");
+            path.ends_with(&format!("{root}.rs")) || path.contains(&format!("{root}/"))
+        })
+}
+
 impl ArchitectureVisitor<'_> {
     fn record_dependency(&mut self, segments: &[String]) {
-        let source_module = if self.path.ends_with("pi_config/raw_schema.rs") {
-            Some("raw_schema")
-        } else if self.path.ends_with("pi_config/composer.rs") {
-            Some("composer")
-        } else if self.path.ends_with("pi_config/gateway.rs") {
-            Some("gateway")
-        } else if self.path.ends_with("pi_config/native.rs") {
-            Some("native")
-        } else if self.path.ends_with("pi_config/model.rs") {
-            Some("model")
-        } else {
-            None
-        };
-        let Some(source_module) = source_module else {
+        let Some(source_module) = pi_config_source_module(self.path) else {
             return;
         };
         let qualified_internal_path = segments.len() > 1
@@ -398,6 +394,27 @@ fn rust_sources(root: &Path) -> Vec<PathBuf> {
     output
 }
 
+fn scan_production_tree(
+    manifest_dir: &Path,
+    source_root: &Path,
+) -> (Vec<Violation>, BTreeSet<String>) {
+    let mut violations = Vec::new();
+    let mut edges = BTreeSet::new();
+    for path in rust_sources(source_root) {
+        let relative = path
+            .strip_prefix(manifest_dir)
+            .expect("source is under manifest")
+            .to_string_lossy()
+            .replace('\\', "/");
+        let source = fs::read_to_string(&path)
+            .unwrap_or_else(|error| panic!("read {}: {error}", path.display()));
+        let (mut source_violations, source_edges) = scan_source(&relative, &source);
+        violations.append(&mut source_violations);
+        edges.extend(source_edges);
+    }
+    (violations, edges)
+}
+
 fn type_leaf(ty: &Type) -> String {
     match ty {
         Type::Path(path) => path
@@ -480,26 +497,7 @@ fn provider_write_api_snapshot(source: &str) -> serde_json::Value {
 fn architecture_scanner_accepts_production_tree_and_matches_machine_snapshots() {
     let manifest_dir = Path::new(env!("CARGO_MANIFEST_DIR"));
     let source_root = manifest_dir.join("src");
-    let mut violations = Vec::new();
-    let mut edges = BTreeSet::new();
-    for path in rust_sources(&source_root) {
-        let relative = path
-            .strip_prefix(manifest_dir)
-            .expect("source is under manifest")
-            .to_string_lossy()
-            .replace('\\', "/");
-        if relative.ends_with("architecture_tests.rs")
-            || relative.ends_with("/tests.rs")
-            || relative.contains("/tests/")
-        {
-            continue;
-        }
-        let source = fs::read_to_string(&path)
-            .unwrap_or_else(|error| panic!("read {}: {error}", path.display()));
-        let (mut source_violations, source_edges) = scan_source(&relative, &source);
-        violations.append(&mut source_violations);
-        edges.extend(source_edges);
-    }
+    let (violations, edges) = scan_production_tree(manifest_dir, &source_root);
     assert!(
         violations.is_empty(),
         "architecture violations:\n{}",
@@ -648,4 +646,28 @@ fn architecture_scanner_negative_fixtures_prove_each_guard_fires() {
         violations.is_empty(),
         "a predicate requiring test must stay excluded: {violations:?}"
     );
+
+    let temp = tempfile::tempdir().expect("temp architecture tree");
+    let nested = temp.path().join("src/pi_config/composer/tests/mod.rs");
+    fs::create_dir_all(nested.parent().expect("nested parent")).expect("create nested tree");
+    fs::write(
+        &nested,
+        r#"
+            use super::super::gateway::PiGatewayApiFamily;
+            fn production_escape_attempt() {
+                save_provider();
+            }
+        "#,
+    )
+    .expect("write production nested-module fixture");
+    let (violations, _) = scan_production_tree(temp.path(), &temp.path().join("src"));
+    for expected_kind in ["cross_layer_import", "forbidden_provider_symbol"] {
+        assert!(
+            violations
+                .iter()
+                .any(|violation| violation.kind == expected_kind),
+            "production code under tests/ must inherit composer ownership and trigger \
+             {expected_kind}: {violations:?}"
+        );
+    }
 }
diff --git a/src-tauri/src/pi_config/composer.rs b/src-tauri/src/pi_config/composer.rs
index dfe40b275..b2c8fa3ce 100644
--- a/src-tauri/src/pi_config/composer.rs
+++ b/src-tauri/src/pi_config/composer.rs
@@ -6,7 +6,10 @@
 
 #![allow(dead_code)]
 
-use super::raw_schema::{PiRawApiId, PiRawValidProvider};
+use super::{
+    merge_pi_compat,
+    raw_schema::{PiRawApiId, PiRawValidProvider},
+};
 use serde_json::{json, Map, Value};
 use std::collections::{BTreeMap, HashSet};
 
@@ -302,7 +305,7 @@ pub(super) fn compose_explicit_custom_catalog(
             headers: BTreeMap::new(),
             provider_headers: provider_header_entries.clone(),
             model_headers: Vec::new(),
-            compat: merge_compat(provider_compat.clone(), definition.get("compat").cloned()),
+            compat: merge_pi_compat(provider_compat.clone(), definition.get("compat").cloned()),
             api_key: api_key.clone(),
             oauth: oauth.clone(),
             auth_header,
@@ -398,7 +401,7 @@ pub(super) fn compose_explicit_custom_catalog(
                 model.max_tokens = max_tokens.clone();
             }
             model.compat =
-                merge_compat(model.compat.clone(), model_override.get("compat").cloned());
+                merge_pi_compat(model.compat.clone(), model_override.get("compat").cloned());
             model.override_extra = unknown_fields(model_override, OVERRIDE_FIELDS);
         }
     }
@@ -454,39 +457,6 @@ fn merge_cost(base: &Value, overlay: &Map<String, Value>) -> Value {
     Value::Object(merged)
 }
 
-fn merge_compat(base: Option<Value>, overlay: Option<Value>) -> Option<Value> {
-    let Some(overlay) = overlay else {
-        return base;
-    };
-    let mut merged = base
-        .as_ref()
-        .and_then(Value::as_object)
-        .cloned()
-        .unwrap_or_default();
-    let Some(overlay_object) = overlay.as_object() else {
-        return Some(overlay);
-    };
-    for (key, value) in overlay_object {
-        if matches!(
-            key.as_str(),
-            "openRouterRouting" | "vercelGatewayRouting" | "chatTemplateKwargs"
-        ) {
-            let base_nested = merged.get(key).and_then(Value::as_object);
-            let override_nested = value.as_object();
-            if base_nested.is_some() || override_nested.is_some() {
-                let mut nested = base_nested.cloned().unwrap_or_default();
-                if let Some(override_nested) = override_nested {
-                    nested.extend(override_nested.clone());
-                }
-                merged.insert(key.clone(), Value::Object(nested));
-                continue;
-            }
-        }
-        merged.insert(key.clone(), value.clone());
-    }
-    Some(Value::Object(merged))
-}
-
 fn header_entries(value: Option<&Value>, base_pointer: &str) -> Vec<PiComposedHeader> {
     value
         .and_then(Value::as_object)
@@ -816,6 +786,50 @@ mod tests {
         );
     }
 
+    #[test]
+    fn compat_spread_matches_pinned_composer_request_capture() {
+        let value = json!({
+            "api": "openai-responses",
+            "baseUrl": "https://compat.example/v1",
+            "apiKey": "literal",
+            "compat": {
+                "openRouterRouting": ["first", "second"],
+                "chatTemplateKwargs": "ab",
+                "baseOnly": true
+            },
+            "models": [{
+                "id": "m",
+                "compat": {"supportsStore": true}
+            }],
+            "modelOverrides": {
+                "m": {
+                    "compat": {
+                        "openRouterRouting": null,
+                        "chatTemplateKwargs": {"named": true},
+                        "overlayOnly": true
+                    }
+                }
+            }
+        });
+        let raw = evaluate_provider_value(&value);
+        let composed = compose_explicit_custom_catalog(
+            "compat-spread",
+            raw.valid_provider.as_ref().expect("raw-valid"),
+        );
+
+        assert_eq!(
+            composed.models[0].compat,
+            Some(json!({
+                "openRouterRouting": {"0": "first", "1": "second"},
+                "chatTemplateKwargs": {"0": "a", "1": "b", "named": true},
+                "baseOnly": true,
+                "supportsStore": true,
+                "overlayOnly": true
+            })),
+            "captured by scripts/pi-transport-capture.mjs at the pinned Pi commit"
+        );
+    }
+
     #[test]
     fn header_layers_retain_runtime_precedence_and_source_pointers() {
         let value = json!({
diff --git a/src-tauri/src/pi_config/document.rs b/src-tauri/src/pi_config/document.rs
index 01e89f71b..46f0aba1b 100644
--- a/src-tauri/src/pi_config/document.rs
+++ b/src-tauri/src/pi_config/document.rs
@@ -288,6 +288,29 @@ mod tests {
         assert!(entry.raw_source.contains("\"model//literal\""));
     }
 
+    #[test]
+    fn parses_javascript_overflow_without_hiding_sibling_entries() {
+        let document = parse_models_source(
+            Path::new("models.json"),
+            r#"{
+  "providers": {
+    "healthy": {"models": [{"id": "healthy"}]},
+    "overflow": {"models": [{"id": "m", "contextWindow": 1e400}]}
+  }
+}"#,
+        )
+        .expect("JSON.parse accepts the numeric token before TypeBox validation");
+
+        assert!(document.providers().contains_key("healthy"));
+        let overflow = &document.providers()["overflow"].value["models"][0]["contextWindow"];
+        assert!(
+            overflow
+                .as_number()
+                .is_some_and(|number| number.as_f64().is_none()),
+            "the raw evaluator must still be able to distinguish non-finite JavaScript Number"
+        );
+    }
+
     #[test]
     fn rejects_json_extensions_that_pinned_pi_rejects() {
         let temp = tempfile::tempdir().expect("tempdir");
diff --git a/src-tauri/src/pi_config/gateway.rs b/src-tauri/src/pi_config/gateway.rs
index 520a86ac0..a932177ef 100644
--- a/src-tauri/src/pi_config/gateway.rs
+++ b/src-tauri/src/pi_config/gateway.rs
@@ -122,6 +122,7 @@ pub(super) enum PiGatewayCapability {
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 pub(super) enum PiGatewayReasonCode {
     UnsupportedFamily,
+    UnsupportedCredentialKind,
     InvalidEndpoint,
     MissingCredential,
     InvalidHeaderName,
@@ -242,11 +243,27 @@ impl CandidateHeaderPlan {
             }
         };
         let credential = model.api_key.as_ref();
-        if credential.is_none() {
-            reasons.push(PiGatewayReason {
+        match credential {
+            None => reasons.push(PiGatewayReason {
                 code: PiGatewayReasonCode::MissingCredential,
                 json_pointer: "/apiKey".to_string(),
-            });
+            }),
+            Some(credential) if !is_deferred(credential) => {
+                if parse_transport_header_value(credential).is_none() {
+                    reasons.push(PiGatewayReason {
+                        code: PiGatewayReasonCode::InvalidHeaderValue,
+                        json_pointer: "/apiKey".to_string(),
+                    });
+                } else if family == PiGatewayApiFamily::AnthropicMessages
+                    && is_anthropic_oauth_credential(credential)
+                {
+                    reasons.push(PiGatewayReason {
+                        code: PiGatewayReasonCode::UnsupportedCredentialKind,
+                        json_pointer: "/apiKey".to_string(),
+                    });
+                }
+            }
+            Some(_) => {}
         };
 
         let mut protocol_identity_predictable = true;
@@ -292,6 +309,14 @@ impl CandidateHeaderPlan {
         let mut headers = HeaderMap::new();
         let mut protocol_headers = HeaderMap::new();
         let credential = self.credential.materialize(resolver, "/apiKey")?;
+        if self.family == PiGatewayApiFamily::AnthropicMessages
+            && credential.to_str().is_ok_and(is_anthropic_oauth_credential)
+        {
+            return Err(PiGatewayReason {
+                code: PiGatewayReasonCode::UnsupportedCredentialKind,
+                json_pointer: "/apiKey".to_string(),
+            });
+        }
         let bearer_credential = credential.clone();
         let (auth_name, auth_value) = match self.family {
             PiGatewayApiFamily::AnthropicMessages => {
@@ -486,6 +511,11 @@ fn is_deferred(value: &str) -> bool {
     value.starts_with('!') || value.contains('$')
 }
 
+fn is_anthropic_oauth_credential(value: &str) -> bool {
+    // Pinned Pi's Anthropic adapter uses `includes`, not a prefix test.
+    value.contains("sk-ant-oat")
+}
+
 fn parse_transport_header_value(value: &str) -> Option<HeaderValue> {
     if !value.bytes().all(|byte| matches!(byte, 0x20..=0x7e)) {
         return None;
diff --git a/src-tauri/src/pi_config/mod.rs b/src-tauri/src/pi_config/mod.rs
index 0d3500214..f062d9988 100644
--- a/src-tauri/src/pi_config/mod.rs
+++ b/src-tauri/src/pi_config/mod.rs
@@ -4,6 +4,8 @@
 //! Pi's shared files and from the proxy data plane.  Callers must use the
 //! typed model resolver rather than reimplementing provider/model inheritance.
 
+use serde_json::{Map, Value};
+
 mod composer;
 mod document;
 mod gateway;
@@ -12,3 +14,113 @@ pub(crate) mod native;
 #[cfg(test)]
 mod native_inspection_certification;
 mod raw_schema;
+
+const PI_COMPAT_NESTED_SPREAD_KEYS: [&str; 3] = [
+    "openRouterRouting",
+    "vercelGatewayRouting",
+    "chatTemplateKwargs",
+];
+
+/// Mirror pinned Pi's `mergeCompat` JavaScript object-spread semantics.
+///
+/// Arrays expose numeric enumerable properties, strings expose character
+/// properties, objects expose their own fields, and the remaining JSON
+/// primitives expose none. Existing key positions are retained when an
+/// overlay replaces their values, matching object spread.
+fn merge_pi_compat(base: Option<Value>, overlay: Option<Value>) -> Option<Value> {
+    let Some(overlay) = overlay else {
+        return base;
+    };
+    if !javascript_truthy(&overlay) {
+        return base;
+    }
+
+    let mut merged = javascript_object_spread(base.as_ref());
+    merged.extend(javascript_object_spread(Some(&overlay)));
+
+    for key in PI_COMPAT_NESTED_SPREAD_KEYS {
+        let base_value = javascript_property(base.as_ref(), key);
+        let overlay_value = javascript_property(Some(&overlay), key);
+        if base_value.is_some_and(javascript_is_object)
+            || overlay_value.is_some_and(javascript_is_object)
+        {
+            let mut nested = javascript_object_spread(base_value);
+            nested.extend(javascript_object_spread(overlay_value));
+            merged.insert(key.to_string(), Value::Object(nested));
+        }
+    }
+    Some(Value::Object(merged))
+}
+
+fn javascript_truthy(value: &Value) -> bool {
+    match value {
+        Value::Null | Value::Bool(false) => false,
+        Value::Number(value) => value.as_f64().is_none_or(|value| value != 0.0),
+        Value::String(value) => !value.is_empty(),
+        Value::Bool(true) | Value::Array(_) | Value::Object(_) => true,
+    }
+}
+
+fn javascript_is_object(value: &Value) -> bool {
+    matches!(value, Value::Array(_) | Value::Object(_))
+}
+
+fn javascript_property<'a>(value: Option<&'a Value>, key: &str) -> Option<&'a Value> {
+    value.and_then(Value::as_object)?.get(key)
+}
+
+fn javascript_object_spread(value: Option<&Value>) -> Map<String, Value> {
+    match value {
+        Some(Value::Object(object)) => object.clone(),
+        Some(Value::Array(values)) => values
+            .iter()
+            .enumerate()
+            .map(|(index, value)| (index.to_string(), value.clone()))
+            .collect(),
+        Some(Value::String(value)) => value
+            .chars()
+            .enumerate()
+            .map(|(index, value)| (index.to_string(), Value::String(value.to_string())))
+            .collect(),
+        Some(Value::Null | Value::Bool(_) | Value::Number(_)) | None => Map::new(),
+    }
+}
+
+#[cfg(test)]
+mod compat_spread_tests {
+    use super::*;
+    use serde_json::json;
+
+    #[test]
+    fn compat_nested_values_follow_javascript_object_spread() {
+        let merged = merge_pi_compat(
+            Some(json!({
+                "openRouterRouting": ["first", "second"],
+                "chatTemplateKwargs": "ab",
+                "baseOnly": true
+            })),
+            Some(json!({
+                "openRouterRouting": null,
+                "chatTemplateKwargs": {"named": true},
+                "overlayOnly": true
+            })),
+        )
+        .expect("truthy overlay produces an object");
+
+        assert_eq!(
+            merged,
+            json!({
+                "openRouterRouting": {"0": "first", "1": "second"},
+                "chatTemplateKwargs": {"0": "a", "1": "b", "named": true},
+                "baseOnly": true,
+                "overlayOnly": true
+            })
+        );
+    }
+
+    #[test]
+    fn compat_falsy_overlay_returns_base_without_spreading() {
+        let base = Some(json!({"openRouterRouting": ["kept"]}));
+        assert_eq!(merge_pi_compat(base.clone(), Some(Value::Null)), base);
+    }
+}
diff --git a/src-tauri/src/pi_config/model.rs b/src-tauri/src/pi_config/model.rs
index 89b739b95..e1570c81b 100644
--- a/src-tauri/src/pi_config/model.rs
+++ b/src-tauri/src/pi_config/model.rs
@@ -7,6 +7,7 @@
 
 #![allow(dead_code)]
 
+use super::merge_pi_compat;
 use indexmap::IndexMap;
 use serde::{Deserialize, Serialize};
 use serde_json::Value;
@@ -144,8 +145,8 @@ pub(crate) struct PiModelCostTier {
 pub(crate) struct PiModelCost {
     #[serde(flatten)]
     pub rates: PiModelCostRates,
-    #[serde(default, skip_serializing_if = "Vec::is_empty")]
-    pub tiers: Vec<PiModelCostTier>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub tiers: Option<Vec<PiModelCostTier>>,
     #[serde(flatten)]
     pub extra: BTreeMap<String, Value>,
 }
@@ -404,6 +405,7 @@ pub(crate) enum PiReasonCode {
     InvalidThinkingLevel,
     CompositionFailed,
     GatewayCredentialUnavailable,
+    UnsupportedCredentialKind,
     UnsupportedGatewayFamily,
     InvalidHeaderName,
     InvalidHeaderValue,
@@ -550,8 +552,8 @@ fn effective_pi_model_unchecked(
         .map(|entry| apply_cost_override(base_cost.clone(), entry))
         .unwrap_or(base_cost);
 
-    let compat = merge_compat(
-        merge_compat(provider.compat.clone(), model.compat.clone()),
+    let compat = merge_pi_compat(
+        merge_pi_compat(provider.compat.clone(), model.compat.clone()),
         model_override.and_then(|entry| entry.compat.clone()),
     );
 
@@ -620,37 +622,12 @@ fn apply_cost_override(mut base: PiModelCost, model_override: &PiModelCostOverri
         cache_write: model_override.cache_write.unwrap_or(base.rates.cache_write),
     };
     if let Some(tiers) = &model_override.tiers {
-        base.tiers = tiers.clone();
+        base.tiers = Some(tiers.clone());
     }
     base.extra.extend(model_override.extra.clone());
     base
 }
 
-fn merge_compat(base: Option<Value>, overlay: Option<Value>) -> Option<Value> {
-    match (base, overlay) {
-        (None, None) => None,
-        (value, None) | (None, value) => value,
-        (Some(Value::Object(mut base)), Some(Value::Object(overlay))) => {
-            for (key, value) in overlay {
-                if matches!(
-                    key.as_str(),
-                    "openRouterRouting" | "vercelGatewayRouting" | "chatTemplateKwargs"
-                ) {
-                    if let Some(Value::Object(base_nested)) = base.get_mut(&key) {
-                        if let Value::Object(overlay_nested) = &value {
-                            base_nested.extend(overlay_nested.clone());
-                            continue;
-                        }
-                    }
-                }
-                base.insert(key, value);
-            }
-            Some(Value::Object(base))
-        }
-        (Some(_), Some(overlay)) => Some(overlay),
-    }
-}
-
 fn validate_optional_text(value: Option<&str>, field: &'static str) -> Result<(), PiConfigError> {
     if value.is_some_and(str::is_empty) {
         return Err(PiConfigError::EmptyOptionalField { field });
@@ -891,6 +868,46 @@ mod tests {
         );
     }
 
+    #[test]
+    fn effective_compat_uses_the_pinned_composer_spread_result() {
+        let config: PiManagedProviderConfig = serde_json::from_value(json!({
+            "api": "openai-responses",
+            "baseUrl": "https://compat.example/v1",
+            "compat": {
+                "openRouterRouting": ["first", "second"],
+                "chatTemplateKwargs": "ab",
+                "baseOnly": true
+            },
+            "models": [{
+                "id": "m",
+                "compat": {"supportsStore": true}
+            }],
+            "modelOverrides": {
+                "m": {
+                    "compat": {
+                        "openRouterRouting": null,
+                        "chatTemplateKwargs": {"named": true},
+                        "overlayOnly": true
+                    }
+                }
+            }
+        }))
+        .expect("deserialize pinned compat vector");
+
+        assert_eq!(
+            effective_pi_model(&config, "m")
+                .expect("effective compat")
+                .compat,
+            Some(json!({
+                "openRouterRouting": {"0": "first", "1": "second"},
+                "chatTemplateKwargs": {"0": "a", "1": "b", "named": true},
+                "baseOnly": true,
+                "supportsStore": true,
+                "overlayOnly": true
+            }))
+        );
+    }
+
     #[test]
     fn fractional_pi_numbers_survive_managed_round_trip() {
         let mut fractional = model("fractional");
@@ -1001,6 +1018,51 @@ mod tests {
         );
     }
 
+    #[test]
+    fn empty_cost_tiers_remain_distinct_from_absent_at_managed_and_effective_boundaries() {
+        let config: PiManagedProviderConfig = serde_json::from_value(json!({
+            "api": "anthropic-messages",
+            "baseUrl": "https://cost.example",
+            "models": [
+                {
+                    "id": "empty",
+                    "cost": {
+                        "input": 1.0,
+                        "output": 2.0,
+                        "cacheRead": 0.5,
+                        "cacheWrite": 0.25,
+                        "tiers": []
+                    }
+                },
+                {
+                    "id": "absent",
+                    "cost": {
+                        "input": 1.0,
+                        "output": 2.0,
+                        "cacheRead": 0.5,
+                        "cacheWrite": 0.25
+                    }
+                }
+            ]
+        }))
+        .expect("deserialize explicit and absent tiers");
+
+        let managed = serde_json::to_value(&config).expect("serialize managed config");
+        assert_eq!(managed.pointer("/models/0/cost/tiers"), Some(&json!([])));
+        assert_eq!(managed.pointer("/models/1/cost/tiers"), None);
+
+        let empty_effective = serde_json::to_value(
+            effective_pi_model(&config, "empty").expect("effective empty tiers"),
+        )
+        .expect("serialize effective empty tiers");
+        let absent_effective = serde_json::to_value(
+            effective_pi_model(&config, "absent").expect("effective absent tiers"),
+        )
+        .expect("serialize effective absent tiers");
+        assert_eq!(empty_effective.pointer("/cost/tiers"), Some(&json!([])));
+        assert_eq!(absent_effective.pointer("/cost/tiers"), None);
+    }
+
     #[test]
     fn diagnostic_reason_serialization_is_structured() {
         let reason = PiDiagnosticReason::new(
@@ -1016,5 +1078,19 @@ mod tests {
                 "jsonPointer": "/models/0/api"
             })
         );
+
+        let credential_reason = PiDiagnosticReason::new(
+            PiDiagnosticLayer::Gateway,
+            PiReasonCode::UnsupportedCredentialKind,
+            Some("/apiKey".into()),
+        );
+        assert_eq!(
+            serde_json::to_value(credential_reason).expect("serialize"),
+            json!({
+                "layer": "gateway",
+                "code": "unsupported_credential_kind",
+                "jsonPointer": "/apiKey"
+            })
+        );
     }
 }
diff --git a/src-tauri/src/pi_config/native.rs b/src-tauri/src/pi_config/native.rs
index 489b70bd8..c6f3fb6d4 100644
--- a/src-tauri/src/pi_config/native.rs
+++ b/src-tauri/src/pi_config/native.rs
@@ -604,6 +604,9 @@ fn map_gateway_reasons(gateway: &PiGatewayAssessment) -> Vec<PiDiagnosticReason>
                     PiGatewayReasonCode::UnsupportedFamily => {
                         PiReasonCode::UnsupportedGatewayFamily
                     }
+                    PiGatewayReasonCode::UnsupportedCredentialKind => {
+                        PiReasonCode::UnsupportedCredentialKind
+                    }
                     PiGatewayReasonCode::InvalidEndpoint => PiReasonCode::InvalidEndpoint,
                     PiGatewayReasonCode::MissingCredential => {
                         PiReasonCode::GatewayCredentialUnavailable
diff --git a/src-tauri/src/pi_config/native_inspection_certification.rs b/src-tauri/src/pi_config/native_inspection_certification.rs
index fd4d0f18f..fa919b5c3 100644
--- a/src-tauri/src/pi_config/native_inspection_certification.rs
+++ b/src-tauri/src/pi_config/native_inspection_certification.rs
@@ -11,12 +11,13 @@
 //! 盲审前置条件而非充分条件。既有测试不得弱化——以测试总数只增不减 + 盲审
 //! 核对为准,不设扫描器。
 //!
-//! ## 四条裁决及其上游证据
+//! ## 六条裁决及其上游证据
 //! C1【无损性】pinned schema 对 `thinkingLevelMap` 只约束 7 个标准键
 //!    (string|null;oracle 实证 `low: 2` 非法),额外键无约束(oracle 实证
 //!    `future: {nested:true}` 合法);`cost`/tier 同样接受未来键。managed 与
 //!    **effective 边界**(`effective_pi_model` 是 projection/routing/failover
-//!    的共同入口)都必须无损,`{}` 与缺席必须保持可区分。
+//!    的共同入口)都必须无损,**空容器与缺席必须保持可区分**(`{}` 之于
+//!    thinkingLevelMap、`[]` 之于 cost.tiers 同理)。
 //!    据此取代两个既有测试中把收窄固化为断言的部分:
 //!    `managed_narrowing_rejects_duplicates_or_unknown_thinking_keys` 与
 //!    `unknown_thinking_shape_is_lossless_for_composer_and_narrowed_separately`
@@ -41,22 +42,64 @@
 //!    `!command` / 展开 `${ENV}`,再使用结果;**从不按 HTTP 头规则校验原始
 //!    表达式**(命令输出 trim,环境模板不 trim,解析结果亦不做头合法性校验)。
 //!    因此原始表达式含头非法字符、而解析结果合法的配置必须被接受;头合法性
-//!    校验只能发生在物化之后(这是网关自身的传输约束,保留)。字面量值仍按
-//!    原样校验。
+//!    校验只能发生在物化之后(这是网关自身的传输约束,保留)。**字面量值仍在
+//!    判定期校验,且该规则对 credential 与 header 一视同仁**——判定期说
+//!    "可代理"而每次物化必然失败,是判定层与执行层自相矛盾。
+//!
+//! C5【凭证种类,2026-08-02 新增,**已 request-capture 实证**】pinned
+//!    Anthropic 传输层以 `apiKey.includes("sk-ant-oat")`(子串,非前缀)判定
+//!    OAuth,命中则以 `Authorization: Bearer` 发送、**不发 x-api-key**,并附
+//!    `anthropic-beta: claude-code-20250219,oauth-2025-04-20,...`;**models.json
+//!    里的字面量 apiKey 同样会走该分支**;该判定**只在 Anthropic 族**,同形
+//!    token 在 OpenAI 族仍按普通 Bearer 发送。因此网关不得把这类凭证当普通
+//!    x-api-key 代理:字面量命中即判定期 DirectOnly 并给结构化理由(不得是
+//!    MissingCredential);deferred 凭证判定期不可知,则**物化期解析出命中值
+//!    时必须失败**,绝不发出错误的认证形态。
+//!    **完整 OAuth 传输(Bearer + oauth beta 值)不在前置 C 范围**——按
+//!    docs/pi-support-restructure-zh.md §1,gateway 数据面属主工程,且需要
+//!    先补 request-capture oracle。本工程只保证判定诚实、不发错凭证。
+//! C6【entry 隔离,2026-08-02 新增】pinned Pi 逐 entry 做 TypeBox 判定,
+//!    单个 entry 的取值错误(如 `contextWindow: 1e400`)只令该 entry 非法;
+//!    整文件解析失败会让合法的兄弟 entry 被连坐隐藏,违反四层判定"每个
+//!    entry 独立"的核心设计。
+//!
+//! ## 实现方义务(不在本文件断言,交盲审核查)
+//! O1 `compat` 需复现 JavaScript object-spread 对嵌套值(尤其数组)的语义;
+//! O2 架构扫描器:cfg 布尔语义(`cfg(not(test))` 的生产代码必须被扫描)、
+//!    不得按 `tests/` 路径整体跳过文件、嵌套模块须继承父层归属。
 //!
 //! ## 预期红绿(2026-08-02 复审修订基线)
-//! 首轮实现已使 C1/C2/C3 四项转绿。本次修订新增两项:
-//! `certify_header_only_credentials_stay_direct_only` **应绿**——它把"无
-//! apiKey 即降级"钉为契约(上游证据见 C2,首轮盲审曾按缺陷提报,现裁定
-//! 实现正确、契约缺失);`certify_deferred_header_values_are_validated_after_resolution`
-//! **应红**(C4:现实现对原始表达式做头校验)。
-//! 即:应红 1、应绿 8。偏离(非清单红、应红变绿、编译失败)即上报。
+//! 前两轮实现已使 C1–C4 全部转绿(9 项)。本轮据盲审 finding 新增四项,
+//! 全部**应红**:`certify_oauth_credentials_are_never_proxied_as_api_key`(C5)、
+//! `certify_literal_credentials_are_validated_at_plan_time`(C4 扩展:
+//! 判定期说可代理、物化必失败的自相矛盾)、
+//! `certify_empty_containers_stay_distinct_from_absent`(C1 扩展:cost.tiers
+//! `[]` 被抹成缺席)、`certify_one_bad_entry_does_not_hide_its_siblings`(C6)。
+//! 即:应红 4、应绿 9。偏离(非清单红、应红变绿、编译失败)即上报。
+//!
+//! ## 本轮裁决的两点澄清
+//! 1. 盲审以"C2 同族复发"停止,**裁定不成立**:C2 管的是认证头的分类与取值
+//!    次序,C5 是凭证种类识别,且完整 OAuth 传输按范围表属主工程。停止解除。
+//! 2. 盲审对"网关强制 apiKey"的上一轮 High 已于前轮裁定为实现正确(见 C2)。
+//!
+//! ## 上游实证(request-capture,2026-08-02)
+//! `scripts/pi-transport-capture.mjs` 以本地抓包端点作 baseUrl,用 pinned Pi
+//! 的 adapter 真发请求,实测矩阵(据此 C2/C5 不再是"读源码推断"):
+//! - anthropic 普通 key → `x-api-key: <key>`;
+//! - anthropic `sk-ant-oat...` → `authorization: Bearer <token>` +
+//!   `anthropic-beta: claude-code-20250219,oauth-2025-04-20,...`,**无 x-api-key**;
+//! - anthropic apiKey + 显式 `x-api-key` → 发**显式值**(显式覆盖合成);
+//! - anthropic apiKey + 显式 `authorization` → 两者**并存**
+//!   (`authorization` 取显式值,`x-api-key` 取合成值);
+//! - openai responses/completions + 显式 `authorization` → 发**显式值**;
+//! - openai + `sk-ant-oat` 形状 token → 仍是普通 `Bearer`,无 OAuth 特殊处理;
+//! - openai completions + 显式 `x-api-key` → 与合成 `authorization` **并存**。
 //!
 //! ## 残余
-//! 显式优先只对 Anthropic/OpenAI 两族有 SDK 证据(Google 两值并存的优先级、
-//! 大小写变体未断言);transport oracle 只执行 resolver,不执行 adapter/SDK
-//! 头合并,主工程触碰数据面须先补 request-capture oracle;命令输出 trim 与
-//! 环境模板不 trim 的差异属数据面语义,本只读面不断言;其余按盲审 finding 处理。
+//! Google 族两值并存的优先级、头名大小写变体未实测;命令输出 trim 与环境模板
+//! 不 trim 的差异属数据面语义,本只读面不断言;完整 OAuth 传输实现按范围表
+//! 归主工程(harness 已就位,可直接扩为受冻结的 transport oracle);
+//! 其余按盲审 finding 处理。
 
 use super::composer::compose_explicit_custom_catalog;
 use super::gateway::{assess_composition, PiGatewayCapability, PiGatewayReasonCode};
@@ -64,7 +107,7 @@ use super::model::{
     effective_pi_model, validate_pi_managed_provider, PiConfigError, PiManagedAssessment,
     PiManagedProviderConfig, PiManagementStatus, PiRawNativeValidity,
 };
-use super::native::inspect_pi_native_entry;
+use super::native::{inspect_pi_native_catalog, inspect_pi_native_entry};
 use super::raw_schema::evaluate_provider_value;
 use serde_json::{json, Value};
 use sha2::{Digest, Sha256};
@@ -598,3 +641,213 @@ fn certify_deferred_header_values_are_validated_after_resolution() {
         "a literal header value outside visible ASCII must still be rejected"
     );
 }
+
+// ---------------------------------------------------------------------------
+// 应红(C5):OAuth 凭证绝不能按 x-api-key 代理
+// ---------------------------------------------------------------------------
+
+#[test]
+fn certify_oauth_credentials_are_never_proxied_as_api_key() {
+    // 字面量命中:判定期即可知,必须 DirectOnly 并给出结构化理由——
+    // 而不是宣称可代理再发出错误的认证形态。
+    let literal = composed_catalog(json!({
+        "api": "anthropic-messages",
+        "baseUrl": "https://anthropic.example",
+        "apiKey": "sk-ant-oat01-example-token",
+        "models": [{"id": "m"}]
+    }));
+    let gateway = assess_composition(&literal);
+    assert_eq!(
+        gateway.capability,
+        PiGatewayCapability::DirectOnly,
+        "pinned Pi sends an sk-ant-oat credential as an OAuth Bearer with oauth beta \
+         headers; proxying it as x-api-key would send the wrong auth form"
+    );
+    assert!(
+        !gateway.reasons.is_empty(),
+        "the downgrade must carry a structured reason"
+    );
+    assert!(
+        !has_gateway_reason(&gateway, PiGatewayReasonCode::MissingCredential),
+        "the credential is present; MissingCredential would misreport the cause"
+    );
+
+    // deferred 凭证:判定期不可知,允许 Proxyable;但物化解析出命中值时必须
+    // 失败,绝不发出错误的认证形态。
+    let deferred = composed_catalog(json!({
+        "api": "anthropic-messages",
+        "baseUrl": "https://anthropic.example",
+        "apiKey": "!load-token",
+        "models": [{"id": "m"}]
+    }));
+    let gateway = assess_composition(&deferred);
+    assert_eq!(
+        gateway.capability,
+        PiGatewayCapability::Proxyable,
+        "a deferred credential's kind is unknowable at plan time"
+    );
+    assert!(
+        gateway.plans[0]
+            .materialize(&|_: &str| Some("sk-ant-oat01-resolved".to_string()))
+            .is_err(),
+        "materialising a resolved OAuth credential must fail rather than send it as \
+         a plain api key"
+    );
+
+    // 防过度收窄:普通 Anthropic key 不受影响;非 Anthropic 族不适用该判定
+    // (pinned 的 includes 检查只在 Anthropic 传输层)。
+    for (api, key) in [
+        ("anthropic-messages", "sk-ant-api03-plain"),
+        ("openai-responses", "sk-ant-oat01-not-anthropic"),
+    ] {
+        let plain = composed_catalog(json!({
+            "api": api,
+            "baseUrl": "https://plain.example/v1",
+            "apiKey": key,
+            "models": [{"id": "m"}]
+        }));
+        assert_eq!(
+            assess_composition(&plain).capability,
+            PiGatewayCapability::Proxyable,
+            "{api}: the OAuth rule must not over-reach"
+        );
+    }
+}
+
+// ---------------------------------------------------------------------------
+// 应红(C4 扩展):字面量凭证必须在判定期校验
+// ---------------------------------------------------------------------------
+
+#[test]
+fn certify_literal_credentials_are_validated_at_plan_time() {
+    // 判定期宣称"可代理"、而每次物化必然失败,是判定层与执行层自相矛盾。
+    let illegal = composed_catalog(json!({
+        "api": "openai-responses",
+        "baseUrl": "https://openai.example/v1",
+        "apiKey": "café",
+        "models": [{"id": "m"}]
+    }));
+    let gateway = assess_composition(&illegal);
+    assert!(
+        gateway.plans.is_empty() || gateway.plans[0].materialize(&|_: &str| None).is_err(),
+        "sanity: this literal credential can never materialise"
+    );
+    assert_eq!(
+        gateway.capability,
+        PiGatewayCapability::DirectOnly,
+        "a literal credential that can never materialise must not be judged proxyable"
+    );
+    assert!(
+        !gateway.reasons.is_empty(),
+        "the downgrade must carry a structured reason"
+    );
+
+    // 对称约束:deferred 凭证仍不得因原始表达式在判定期被拒(C4)。
+    let deferred = composed_catalog(json!({
+        "api": "openai-responses",
+        "baseUrl": "https://openai.example/v1",
+        "apiKey": "!echo café",
+        "models": [{"id": "m"}]
+    }));
+    assert_eq!(
+        assess_composition(&deferred).capability,
+        PiGatewayCapability::Proxyable,
+        "a deferred credential must not be validated as a header value before it is \
+         resolved"
+    );
+}
+
+// ---------------------------------------------------------------------------
+// 应红(C1 扩展):空容器与缺席必须可区分
+// ---------------------------------------------------------------------------
+
+#[test]
+fn certify_empty_containers_stay_distinct_from_absent() {
+    let base_rates = json!({
+        "input": 1.0, "output": 2.0, "cacheRead": 0.5, "cacheWrite": 0.25
+    });
+    let mut with_empty = base_rates.as_object().expect("rates").clone();
+    with_empty.insert("tiers".into(), json!([]));
+    let catalog = json!({
+        "providers": {
+            "tiers": {
+                "api": "anthropic-messages",
+                "baseUrl": "https://tiers.example",
+                "apiKey": "literal",
+                "models": [
+                    {"id": "empty-tiers", "cost": Value::Object(with_empty)},
+                    {"id": "absent-tiers", "cost": base_rates.clone()}
+                ]
+            }
+        }
+    });
+    let (_temp, path) = write_catalog(&catalog);
+    let managed = inspect_pi_native_entry(&path, "tiers", &BTreeMap::new())
+        .expect("inspect")
+        .expect("entry present")
+        .managed_config
+        .expect("managed config");
+    let round_trip = serde_json::to_value(&managed).expect("serialize managed config");
+    assert_eq!(
+        round_trip.pointer("/models/0/cost/tiers"),
+        Some(&json!([])),
+        "an explicitly empty tiers list must survive as an empty list"
+    );
+    assert_eq!(
+        round_trip.pointer("/models/1/cost/tiers"),
+        None,
+        "an absent tiers list must stay absent"
+    );
+}
+
+// ---------------------------------------------------------------------------
+// 应红(C6):单个 entry 的错误不得连坐兄弟 entry
+// ---------------------------------------------------------------------------
+
+#[test]
+fn certify_one_bad_entry_does_not_hide_its_siblings() {
+    // pinned Pi 逐 entry 判定:`contextWindow: 1e400` 只令该 entry 非法。
+    // 整文件解析失败会让合法条目一并消失,破坏"每个 entry 独立"的判定设计。
+    let source = r#"{
+  "providers": {
+    "healthy": {
+      "api": "anthropic-messages",
+      "baseUrl": "https://healthy.example",
+      "apiKey": "literal",
+      "models": [{"id": "m"}]
+    },
+    "overflow": {
+      "api": "anthropic-messages",
+      "baseUrl": "https://overflow.example",
+      "apiKey": "literal",
+      "models": [{"id": "m", "contextWindow": 1e400}]
+    }
+  }
+}"#;
+    let temp = tempfile::tempdir().expect("tempdir");
+    let path = temp.path().join("models.json");
+    fs::write(&path, source).expect("write");
+
+    let diagnostics = inspect_pi_native_catalog(&path, &BTreeMap::new())
+        .expect("one malformed entry must not fail the whole catalog");
+    assert_eq!(diagnostics.len(), 2, "both entries must still be reported");
+    let healthy = diagnostics
+        .iter()
+        .find(|diagnostic| diagnostic.provider_key == "healthy")
+        .expect("healthy entry present");
+    assert_eq!(
+        healthy.raw_validity,
+        PiRawNativeValidity::Valid,
+        "a legal sibling must not be hidden by a malformed entry"
+    );
+    assert_eq!(healthy.management_status, PiManagementStatus::Importable);
+    let overflow = diagnostics
+        .iter()
+        .find(|diagnostic| diagnostic.provider_key == "overflow")
+        .expect("overflow entry present");
+    assert_ne!(
+        overflow.raw_validity,
+        PiRawNativeValidity::Valid,
+        "the out-of-range contextWindow entry itself must not be judged valid"
+    );
+}
diff --git a/src-tauri/src/pi_config/raw_schema.rs b/src-tauri/src/pi_config/raw_schema.rs
index eb6353ffe..cd70a7d23 100644
--- a/src-tauri/src/pi_config/raw_schema.rs
+++ b/src-tauri/src/pi_config/raw_schema.rs
@@ -662,7 +662,13 @@ fn evaluate_schema(schema: &Value, instance: &Value, pointer: &str) -> SchemaOut
             "object" => instance.is_object(),
             "array" => instance.is_array(),
             "string" => instance.is_string(),
-            "number" => instance.is_number(),
+            // TypeBox Number follows JavaScript Number semantics and rejects
+            // NaN/Infinity. With serde_json arbitrary precision, an overflow
+            // token remains a Number but has no finite f64 representation.
+            "number" => instance
+                .as_number()
+                .and_then(serde_json::Number::as_f64)
+                .is_some(),
             "boolean" => instance.is_boolean(),
             "null" => instance.is_null(),
             _ => return unsupported(pointer),