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.

docs/persistence-catalog.md

@@ -557,7 +557,7 @@ Source: [`packages/core/session/src/types.ts:304`](../packages/core/session/src/
 
 Types: [SessionTitleEventData](core-data-structures/session-title.md)
 
-Source: [`packages/session-title/session-title/src/index.ts:100`](../packages/session-title/session-title/src/index.ts)
+Source: [`packages/session/session-title/src/index.ts:100`](../packages/session/session-title/src/index.ts)
 
 #### `session/title-llm-request` — log-only
 
@@ -568,7 +568,7 @@ Source: [`packages/session-title/session-title/src/index.ts:100`](../packages/se
 
 Types: [SessionTitleLlmRequestEventData](core-data-structures/session-title.md)
 
-Source: [`packages/session-title/session-title-llm/src/index.ts:43`](../packages/session-title/session-title-llm/src/index.ts)
+Source: [`packages/session/session-title-llm/src/index.ts:43`](../packages/session/session-title-llm/src/index.ts)
 
 ### `step/*`