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.

packages/todo/tool-todo/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/todo/tool-todo/README.md
-README.md: 914e89a000e4bb87ebd7844f05db3809c6726528
-README.zh.md: c88dbf976fa5110028fcc964ab9aa8efcc3244d3
+README.md: 7c993ac6f7f0047d008a09e5ff52cb752f94763c
+README.zh.md: 9cea66147beddab7d62ed7344cbe866495e28022

packages/todo/tool-todo/README.md

@@ -30,7 +30,7 @@ The canonical result is `{ todos, counts: { pending, inProgress, completed } }`;
 
 ## Session projection
 
-When the composition mounts `ctx.sessionProjections` ([`@deepseek-ai/dsh-session-projection`](../../session-projection/session-projection/README.md)), this package registers the `todos` projection unit under an injected child: `init` = `null` (no write yet), `apply` = take the whole list from each `todo/write` and clear to `null` on each `turn/start` (standing plan; `turn/end` keeps the finished checklist; every other event returns the same state reference), `view` = identity, `stateVersion` = 2. The key merges into `SessionProjectionMap` here (via the interface package's `/types` outlet); the framework drives the unit and carriers serve the value on the history tail page and the `session/projection` push frame. Compositions without the registry are unaffected. Lifetime rationale: [todo plan clears on next turn](../../../.agents/notes/implemented/feature/2026-07-28-todo-plan-clears-on-next-turn.md).
+When the composition mounts `ctx.sessionProjections` ([`@deepseek-ai/dsh-session-projection`](../../session/session-projection/README.md)), this package registers the `todos` projection unit under an injected child: `init` = `null` (no write yet), `apply` = take the whole list from each `todo/write` and clear to `null` on each `turn/start` (standing plan; `turn/end` keeps the finished checklist; every other event returns the same state reference), `view` = identity, `stateVersion` = 2. The key merges into `SessionProjectionMap` here (via the interface package's `/types` outlet); the framework drives the unit and carriers serve the value on the history tail page and the `session/projection` push frame. Compositions without the registry are unaffected. Lifetime rationale: [todo plan clears on next turn](../../../.agents/notes/implemented/feature/2026-07-28-todo-plan-clears-on-next-turn.md).
 
 ## Export shape
 

packages/todo/tool-todo/README.zh.md

@@ -30,7 +30,7 @@
 
 ## 会话投影
 
-当组合挂载了 `ctx.sessionProjections`（[`@deepseek-ai/dsh-session-projection`](../../session-projection/session-projection/README.md)）时，本包在一个注入的子插件中注册 `todos` 投影单元：`init` = `null`（尚无写入）、`apply` = 从每个 `todo/write` 取整表，并在每个 `turn/start` 清为 `null`（当前有效计划；`turn/end` 保留刚完成的清单；其余事件都返回同一个状态引用）、`view` = 恒等、`stateVersion` = 2。该键在本包中合并进 `SessionProjectionMap`（经接口包的 `/types` 出口）；框架驱动该单元，载体通过历史尾页与 `session/projection` 推送帧提供该值。未挂载注册表的组合不受影响。生命周期理由见 [在下一轮次清空 todo 计划](../../../.agents/notes/implemented/feature/2026-07-28-todo-plan-clears-on-next-turn.md)。
+当组合挂载了 `ctx.sessionProjections`（[`@deepseek-ai/dsh-session-projection`](../../session/session-projection/README.md)）时，本包在一个注入的子插件中注册 `todos` 投影单元：`init` = `null`（尚无写入）、`apply` = 从每个 `todo/write` 取整表，并在每个 `turn/start` 清为 `null`（当前有效计划；`turn/end` 保留刚完成的清单；其余事件都返回同一个状态引用）、`view` = 恒等、`stateVersion` = 2。该键在本包中合并进 `SessionProjectionMap`（经接口包的 `/types` 出口）；框架驱动该单元，载体通过历史尾页与 `session/projection` 推送帧提供该值。未挂载注册表的组合不受影响。生命周期理由见 [在下一轮次清空 todo 计划](../../../.agents/notes/implemented/feature/2026-07-28-todo-plan-clears-on-next-turn.md)。
 
 ## 导出形状
 

packages/todo/tool-todo/tsconfig.json

@@ -24,7 +24,7 @@
       "path": "../../core/session"
     },
     {
-      "path": "../../session-projection/session-projection"
+      "path": "../../session/session-projection"
     },
     {
       "path": "../../support/invariants"