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/mermaid/session-lifecycle.mmd

@@ -0,0 +1,56 @@
+sequenceDiagram
+    participant User
+    participant Pi
+    participant Extension
+    participant MD as Markdown (~/.pi/agent/...)
+    participant SQL as SQLite (sessions.db)
+
+    Note over Pi,SQL: ── Session Start ──
+    Pi->>Extension: session_start event
+    Extension->>MD: loadFromDisk() — MEMORY.md + USER.md + failures.md + skills/
+    Extension-->>Extension: Load searchable memory stores
+
+    Note over Pi,SQL: ── System Prompt Context ──
+    Pi->>Extension: before_agent_start event
+    Extension-->>Pi: systemPrompt + compact memory policy
+    Note right of Pi: Default mode does NOT inject full Markdown memory
+    opt memoryMode = legacy-inject
+        Extension-->>Pi: systemPrompt + legacy memory blocks
+    end
+
+    Note over Pi,SQL: ── Agent Loop (memory add) ──
+    User->>Pi: "Remember I prefer vim"
+    Pi->>Extension: tool_call (memory, add)
+    Extension->>Extension: scanContent() security check
+    Extension->>MD: Atomic write to USER.md
+    alt Markdown save success
+        Extension->>SQL: best-effort sync to memories table
+        Extension-->>Pi: success (plus warning only if sync fails)
+    else Markdown save fails (limit/validation)
+        Extension-->>Pi: fail (no SQLite-only fallback)
+    end
+
+    Note over Pi,SQL: ── User Correction ──
+    User->>Pi: "No, don't use npm — use pnpm"
+    Extension->>Extension: isCorrection() = true
+    Extension->>Pi: pi.exec("pi -p", correctionPrompt)
+    Extension->>MD: Save [correction] failure memory
+    Extension->>SQL: best-effort correction sync
+
+    Note over Pi,SQL: ── Search + Backfill ──
+    Pi->>Extension: memory_search(query)
+    Extension->>SQL: FTS5 search memories
+    SQL-->>Extension: results
+    Pi->>Extension: /memory-sync-markdown
+    Extension->>MD: scan global + project Markdown files
+    Extension->>SQL: idempotent Markdown → SQLite import
+
+    Note over Pi,SQL: ── Background Learning ──
+    Pi->>Extension: turn_end (10 turns or 15 tool calls)
+    Extension->>Pi: pi.exec("pi -p", reviewPrompt)
+    Note right of Pi: Review can save memories/failures/skills
+
+    Note over Pi,SQL: ── Session End ──
+    Pi->>Extension: session_shutdown event
+    Extension->>Pi: pi.exec("pi -p", flushPrompt)
+    Note right of Pi: final chance to save durable learnings