docs(code-runtime-python): register the fragment-seal, CPU soft-lowering, and done-send fallback fixes

Keep the settlement note current with the latest code-review fixes:
- New Decision section for the _LogStream fragment seal, the _clamped
  RLIMIT_CPU soft-lowering (and its hard==1 blind spot), the send_done
  fallback frame, and the reply-queue slot release.
- Testing registers the fragment-cap drip (no-fail-before), the dual-limit CPU
  overrun, and the transitive-name rebind cases.
- zh mirrored; settlement-fixes.i18n.yaml re-recorded and consistent.

.agents/notes/implemented/bug-fix/2026-07-31-code-runtime-python-settlement-fixes.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 .agents/notes/implemented/bug-fix/2026-07-31-code-runtime-python-settlement-fixes.md
-2026-07-31-code-runtime-python-settlement-fixes.md: ce5670c3623e1670eaab07f7c68d2d56fff3d0c7
-2026-07-31-code-runtime-python-settlement-fixes.zh.md: 50d75498805f79b8d5ee0b370e0fa7a3ecc3da0f
+2026-07-31-code-runtime-python-settlement-fixes.md: 8492d670629ea4358b5dd0a3b6aac8922b609c4b
+2026-07-31-code-runtime-python-settlement-fixes.zh.md: 6558386f4bf18eaaa96254f7a62e650904f5e6bc