docs(tools): align Code Mode docs with multi-language dispatch; py-types notes

Address ds-review-bot v5/v6 review round 3:
- Config.mode JSDoc and the regenerated config-catalog no longer claim Code
  Mode requires a TypeScript runtime; both now say a language with a
  registered SDK renderer.
- The active 2026-06-15-code-mode base note (both languages) follows shipped
  reality: the SDK renders the loaded runtime's language, dsh-tools accepts
  any language with a renderer and run_code flavor, and it cross-links the
  language-dispatch note.
- The language-dispatch note distinguishes the two Object.hasOwn guards'
  reachability and documents the peekRuntime no-runtime degrade vs the
  rejected silent fallback.
- SDK_RENDERERS comment: adding a language is two table entries, not one.
- py-types: document the deliberate PEP 586 deviation for float Literals;
  add oneOf-object-branch tests (named union classes and context-free
  degrade), keeping py-types.ts at 100% per-file coverage.

.agents/notes/implemented/feature/2026-06-15-code-mode.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/feature/2026-06-15-code-mode.md
-2026-06-15-code-mode.md: b6a24ecd9700e32912b8112b59cbd8b6ab131eb5
-2026-06-15-code-mode.zh.md: 4d0a4cf8fa31cf9d9954e5bd95f823dfc0668444
+2026-06-15-code-mode.md: 31b39842bb20135517f41ced3f586d61454023e3
+2026-06-15-code-mode.zh.md: 88bade054928d4a2a76316825a49109fae104eb7