docs(code-runtime-python): register the pre-encode, stray-flush, and late-rejection fixes in the settlement note

Keep the agent note current with the recently landed code-review fixes:
- six -> nine no-fail-before cases, adding the done-value TOCTOU pre-encoding,
  the stray-UTF-8 budget-flush retention, and the late-rejection settled guard,
  each with its reason for not carrying a fail-before test.
- New Decision sections for the pre-encode + send_done binding and the stray
  flush retention; Testing lists the binding-all-names case as a tested fix.
- 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: 1a55169bc27f1add06689d4a5582fd6e843bc354
-2026-07-31-code-runtime-python-settlement-fixes.zh.md: d567ce58864479ee92388374f0ec6125614d7d71
+2026-07-31-code-runtime-python-settlement-fixes.md: 4ab813d0b87f144d2a89c73e65f2579899a07acc
+2026-07-31-code-runtime-python-settlement-fixes.zh.md: 346e91dab39ec0268707c696416d66bea839291b