Merge remote-tracking branch 'origin/master' into codex/disable-telemetry-default

Resolve three conflicts:

- packages/bundle/base/tests/base.spec.ts: keep both assertion sets — this
  branch's telemetry-otel mode expression and master's subagent rows plus
  manifest dependencies.
- packages/session/session-telemetry-otel/tests/otel.spec.ts: keep master's
  per-mode sharing disclosure test, but select FULL explicitly instead of
  relying on an omitted mode, because the default is now DISABLED; the
  default-construction test keeps asserting disabled delivery and gains a
  case pinning that an omitted mode reports 'disabled' sharing.
- scripts/snapshots/translation-prompt-v4/request-response.expected.json:
  re-recorded from the merged READMEs rather than hand-merging the embedded
  document text.

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 README.md
-README.md: e662caa94542d86bcc9dcab652b5932a89751b9a
-README.zh.md: 4539a730ca0de5c714384d8eea2f993fbe2f6a6e
+README.md: 71103650b07ec350188e5a2de07f41e6f048fcc7
+README.zh.md: 15a8e38693ad889470a6257796fa35e702facfb3