chore: remove ADR-002 documentation

[bbopen]

Summary

Removes the ADR-002 BridgeProtocol architecture document now that the implementation is complete and merged.

Rationale

• ADR-002 served as planning documentation during development
• The implementation is now complete (PRs feat(codec): integrate SafeCodec into Python bridge for NaN rejection #159, feat(process-io): harden stream error handling and add write queue timeout #160, fix(codec): handle multi-dimensional ndarrays with Arrow encoding #162, fix(codec): extract Arrow values as plain arrays for ndarray decoding #163)
• Keeping large planning docs after implementation adds clutter

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📥 Commits

Reviewing files that changed from the base of the PR and between 26140c5 and 49cc3c7.

📒 Files selected for processing (1)

• docs/adr/002-bridge-protocol.md

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