feat(pi-permission-system): AutoReview 改为跟随主模型的对话式工具调用审查

AutoReview：

- 审查器回到 Codex Guardian 风格的对话式审查，默认跟随会话当前主模型
  （每次审查实时读取 ctx.model）；provider/model 必须同时设置才固定审查
  模型，只设其一视为配置错误并转人工。
- 结论只通过 approve / reject 两个工具给出，参数仅 reason；不强制
  toolChoice，正文文本（即使是合法 JSON）一律忽略。
- approve 自动放行；reject 转人工并在弹窗显示理由（标注模型生成）。
  超时、Provider 错误、截断、未调用工具、多次调用、参数无效等异常同样
  转人工，并附固定的系统说明；用户按 Esc 中止时直接拒绝。
- 模型调用改为 modelRegistry.streamSimple(...).result()：Pi 1.3.0 面向
  扩展的 ModelRegistry 没有 completeSimple，原写法在真实环境中每次都会
  转人工。
- 对话记录保留可信度标注；工具结果在有更短的 pi-compaction 摘要时替换
  为摘要；token 估算改为非 ASCII 字符按 1 token 计；预算可配置。
- 同一条用户消息内完全相同的请求只缓存 approve 结论。
- 默认 reasoning low、总超时 30 秒、最多 2 次尝试、maxOutputTokens 4000。

删除：

- 未发布过的 TypeSafe Jev 分类器实现、DenialCircuitBreaker。
- 整个 annotator 机制（model-explanation、注册表、registerAnnotator、
  provider-timeout）；annotators 配置键保留为已弃用并忽略，避免旧配置
  被拒绝。

测试：

- 新增 reviewer / transcript / 弹窗说明 / 默认配置测试；清理重复、恒真
  或只测实现细节的旧测试。
- 使用 deepseek-v4.1-flash 实测 5 个场景各 5 次，25 次结论全部符合预期。

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

pi-permission-system/test/handlers/gates/helpers.test.ts

@@ -9,7 +9,6 @@ import {
   deriveResolution,
   resolveYoloGrant,
 } from "#src/handlers/gates/helpers";
-import { posixPathFlavor } from "#src/path/path-flavor";
 import type { PermissionCheckResult } from "#src/types";
 import { makeCheckResult } from "#test/helpers/handler-fixtures";
 
@@ -130,50 +129,18 @@ describe("buildDecisionEvent", () => {
     });
   });
 
-  it("normalises undefined origin to null", () => {
+  it("normalises absent optional fields to null", () => {
     const event = buildDecisionEvent(
-      { surface: "bash", value: "git status" },
-      makeCheck({ origin: undefined }),
+      { surface: "read", value: "read" },
+      makeCheck({ origin: undefined, matchedPattern: undefined }),
       null,
-      "allow",
-      "user_approved",
+      "deny",
+      "policy_deny",
     );
     expect(event.origin).toBeNull();
-  });
-
-  it("normalises null agentName to null", () => {
-    const event = buildDecisionEvent(
-      { surface: "read", value: "read" },
-      makeCheck(),
-      null,
-      "deny",
-      "policy_deny",
-    );
     expect(event.agentName).toBeNull();
-  });
-
-  it("normalises undefined matchedPattern to null", () => {
-    const event = buildDecisionEvent(
-      { surface: "read", value: "read" },
-      makeCheck({ matchedPattern: undefined }),
-      null,
-      "deny",
-      "policy_deny",
-    );
     expect(event.matchedPattern).toBeNull();
   });
-
-  it("passes result and resolution through", () => {
-    const event = buildDecisionEvent(
-      { surface: "bash", value: "rm -rf /" },
-      makeCheck(),
-      null,
-      "deny",
-      "user_denied",
-    );
-    expect(event.result).toBe("deny");
-    expect(event.resolution).toBe("user_denied");
-  });
 });
 
 describe("resolveYoloGrant", () => {
@@ -227,18 +194,6 @@ describe("resolveYoloGrant", () => {
 });
 
 describe("accessFactsFromPath", () => {
-  it("projects the AccessPath's match set and boundary as strings", () => {
-    const path = AccessPath.forPath("/outside/x.ts", {
-      cwd: "/repo",
-      flavor: posixPathFlavor,
-    });
-    expect(accessFactsFromPath("external_directory", path)).toEqual({
-      surface: "external_directory",
-      matchValues: path.matchValues(),
-      boundaryValue: path.boundaryValue(),
-    });
-  });
-
   it("collapses an empty boundary (literal-only path) to null", () => {
     const path = AccessPath.forLiteral("relative-token");
     expect(path.boundaryValue()).toBe("");