feat(pi-hermes-memory): 导入上游 v0.9.10 源码快照

从官方 Git 仓库导入 chandra447/pi-hermes-memory 在 tag v0.9.10
（df624056a2e8c68bc89ba0a81e1c120856ec9665，2026-10-02）的源码快照。
本次仅导入源码，尚未接入组合包：package.json、加载顺序、依赖与权限策略
均未改动。

- 原样导入 src/、tests/、docs/、scripts/、README、CHANGELOG、PLAN、
  AGENTS 与 LICENSE；该快照共 156 个上游文件。
- 剔除嵌套 .git、上游 .github 工作流、.ralph/、.claude/、node_modules、
  覆盖率与构建产物。
- 新增中文 UPSTREAM.md，记录来源，以及启用前必须完成的待决事项：
  在 pi-compaction 之前注册加载顺序、better-sqlite3 版本与根 allowScripts
  对齐、strip-ansi 解析确认。
- 说明选择 tag 而非 main 的原因：导入时上游 main 已领先至
  24fcd8ad26fc27badb8d7dbaf8034645de07b893（2026-10-11），选 tag 是为
  对应一个已发布、可复现的版本。

尚未接线。启用前还需反转 tests/extension-load.test.ts 中"不得加载
Hermes"的断言，并同步 pi-tool-search 分组、权限策略与文档。

验证：快照 156 个上游文件全部导入，目录内仅多出 UPSTREAM.md 一份；
已确认与上游 main 内容存在差异，证明取的是 tag 而非 main。

pi-hermes-memory/docs/0.6/CHANGELOG.md

@@ -0,0 +1,57 @@
+# v0.6.6 Changelog
+
+## Bug Fixes
+
+### Fix legacy SQLite upgrade error: `no such column: category`
+
+Some users upgrading from older versions had an existing `sessions.db` with a legacy
+`memories` table that did not include v0.6 failure-memory columns. During schema init,
+creating `idx_memories_category` failed and `/memory-index-sessions` crashed with:
+
+`❌ Session indexing failed: no such column: category`
+
+Fix:
+
+- Added automatic legacy schema migration in `DatabaseManager`
+- Detects missing `memories` columns and adds them idempotently:
+  - `category`
+  - `failure_reason`
+  - `tool_state`
+  - `corrected_to`
+- Retries schema initialization after migration
+- Added regression test: `should migrate legacy memories table without category column`
+
+---
+
+# v0.6.5 Changelog
+
+## Bug Fixes
+
+### Auto-review no longer blocks interactive chat (#10)
+
+The background auto-review was `await`ing `pi.exec()` inside the `turn_end` handler, which
+blocked the chat from responding while the review subprocess ran. Fixed by making the
+review subprocess fire-and-forget — the turn_end handler returns immediately, and the
+subprocess completes asynchronously.
+
+- `pi.exec()` is no longer awaited — handler returns immediately
+- `reviewInProgress` guard resets in `.then()` / `.catch()` callbacks
+- Overlapping reviews are still prevented by the guard
+- Notifications are delivered via `.then()` callback once the subprocess completes
+
+### Auto-review failures on Windows no longer show errors (#9)
+
+On Windows git-bash, `pi exec` subprocesses could exit with code 1 producing
+`[hermes] auto-review failed (exit=1): unknown error` messages every few turns. Fixed by
+making auto-review truly best-effort — non-zero exit codes and spawn errors are silently
+ignored.
+
+- Suppressed error notifications for non-zero exit codes
+- Suppressed error notifications for subprocess failures (timeout, signal, spawn)
+- The next review cycle will retry automatically
+
+### Crash safety
+
+- Snapshot-building code (`getBranch()`, message parsing) is wrapped in a minimal try/catch
+  to handle expired sessions gracefully
+- Early return resets `reviewInProgress` guard to unblock future reviews