refactor(session): fold the session family into packages/session/

git mv the 12 packages from session-persistence/, session-projection/,
session-title/, and telemetry/ into one session/ group per the
regrouping RFC; merge the four group READMEs into one bilingual
triplet; rewrite the group segment in tsconfig references (intra-group
references shorten to ../<pkg>), tsconfig.base.json paths/globs,
knip.json keys, vitest include, gate scripts, and authored doc/note
citations; regenerate module graph, doc graphs, catalogs, and the
lockfile importer keys. No npm names change.

Full unit suite: 8779 passed; the 18 reported failures reproduce as
env flakes (ambient-proxy IPv6 tunneling, watched-dir inotify
timeouts under parallel load) — each passes in isolation with
NO_PROXY set, matching their known pre-existing behavior on master.

.agents/notes/rejected/simplification/2026-06-20-fold-session-persistence-interface.zh.md

@@ -22,7 +22,7 @@ Status: rejected — 独立的持久化接口包是为持久化后端设计的
 - `dsh-session` 导出持久化服务类型、协调器和契约辅助工具。
 - JSONL 和 SQLite 后端包直接依赖 `dsh-session`。
 - `agent-loop` 的恢复功能使用会话包拥有的服务键。
-- [会话持久化](../../implemented/architecture/2026-06-14-session-persistence.md)、[共享持久化写入协调器](../../implemented/architecture/2026-06-18-shared-persistence-write-coordinator.md)与[包文档](../../../../packages/session-persistence/session-persistence/README.md)说明后端实现为何仍保持独立。
+- [会话持久化](../../implemented/architecture/2026-06-14-session-persistence.md)、[共享持久化写入协调器](../../implemented/architecture/2026-06-18-shared-persistence-write-coordinator.md)与[包文档](../../../../packages/session/session-persistence/README.md)说明后端实现为何仍保持独立。
 
 ## 放弃了什么