Mark c0d9166a1d feat(fix-d12): add binary encode/decode helpers in src/shared/binary.ts ...

- Add blobToBase64 / base64ToBlob in src/shared/binary.ts:
  portable Blob↔base64 round-trip for the chrome.runtime.Port
  wire-format. JSON.stringify(blob) returns "{}" across extension
  contexts, so binary payloads must travel as base64 strings.
- Mirror the GREEN-block helper signatures from
  tests/offscreen/port-serialization.test.ts so the same test pins
  both the standalone helpers and the production wire format.
- Land tests/offscreen/port-serialization.test.ts as the RED+GREEN
  executable contract for the D-12 fix: the RED block reproduces
  the 75-byte "[object Object]" failure mode byte-for-byte; the
  GREEN block pins the base64 wire-format the fix must implement.
- Uses arrayBuffer() + btoa(String.fromCharCode...) rather than
  FileReader: FileReader is browser-only; the chosen approach
  works in both Chrome extension contexts and the Node-based
  vitest environment.

Refs: debug session d12-blob-port-transfer-fails.

2026-05-15 20:06:51 +02:00

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