Merge branch 'master' into fix/human-transcript-projection

Conflicts, all in files this branch and master both touched:

- `chat/helpers.ts` — kept both sides. Master replaced the inline env
  filter in `gitBranch` with `scrubbedParentEnv()`; this branch added the
  surface-marker and compaction-source imports.
- `docs/module-graph.md` — regenerated. Both sides added a `tui` edge
  (master `subprocess`, this branch `compact`); the generated row now
  carries both.
- Three `.i18n.yaml` pairing records — re-recorded from the merged files.
  Blob hashes cannot be hand-merged, and both sides' prose survives on
  each side of every pair.

`docs/cordis-catalog/services.md` also regenerated for shifted source
lines and master's new `sessionTitle.rename` entry.

docs/core-data-structures/session.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 docs/core-data-structures/session.md
-session.md: 0facaa3583a00e8065535832cf99ac4183694a71
-session.zh.md: 00168b0ebdd1ff9d9be77cba616ef81498c01f37
+session.md: 0c89f69ec0ccb893bb785e4f717cfd8ccb754514
+session.zh.md: 7c966ee2c779954d863b53c45e29be28458e675f