- Drop the unused @deepseek-ai/dsh-code-runtime dependency: this layer
imports nothing from the seam (protocol.ts has no imports; the invariant
companion uses only cordis and dsh-invariants). The backend-core PR
re-adds it when PythonCodeRuntime consumes the seam. Fixes knip.
- Point the Agent Note's cross-reference to the seam note at the English
target on both language sides, per the bilingual-pairing contract (only
the language switcher flips to .zh.md). Re-record the sidecar.
- Add the Known Limitations section both READMEs require, covering the
cross-language guard's scope and the deferred runtime implementation.
- Regenerate the module graph for the dropped dependency edge.
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