refactor(python): merge safe_codec into tywrap_bridge_core

[bbopen]

Summary

• Move the Python BridgeCodec, CodecError, and convenience encode/decode
  functions into runtime/tywrap_bridge_core.py.
• Delete runtime/safe_codec.py and update direct imports.
• Keep the existing python_bridge.py compatibility re-exports.
• Regenerate the embedded Pyodide bridge core.

What broke and why it cannot now

The subprocess and Pyodide paths previously split Python codec behavior across
safe_codec.py and bridge-core equivalents. Codec value handling and payload
limits now come from one implementation, so the two runtimes cannot drift when
new Python value types or validation rules are added.

BREAKING CHANGE

Direct imports from the internal runtime.safe_codec module must change to
runtime.tywrap_bridge_core. Public names remain available from bridge core,
and python_bridge.py retains its existing compatibility exports.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: ed4e5a73-0426-4a9b-8f80-506217718712

📥 Commits

Reviewing files that changed from the base of the PR and between 0a03aaa and bebe8d8.

📒 Files selected for processing (5)

• runtime/python_bridge.py
• runtime/safe_codec.py
• runtime/tywrap_bridge_core.py
• src/runtime/pyodide-bootstrap-core.generated.ts
• test/python/test_bridge_codec.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch refactor/0.9-safe-codec-merge

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