[HengYangDS]

Session-specific indexing rereads an entire append-only transcript instead of continuing from its indexed high-water mark. This uses MAX(line_end) for that path and refreshes the archive when the source size changes, even when timestamps tie. Summary generation is unchanged.

The change owns append indexing in src/indexer.ts and archive refresh in src/sync.ts. It does not reconcile truncation, same-length rewrites or an assistant continuation that straddles the stored watermark. #193 owns those cases; its reconciliation should preserve this append fast path. #190 adds compressed Codex sources, rather than a second indexing policy.

Validation

Head: 28657ccee261cf173812597c2839c788094b1420; base: 7e06519357777badd7a115d2014a7ef845904310.

The October 11 macOS arm64 qualification on Node 24.19.0/npm 12.2.0 passed native npm ci, build, bundle syntax and all 351 tests across 63 files, including three packaged MCP tests. It reused a captured resolver lock and a prepared model cache; cold-model loading and hosted Linux/Windows execution remain unverified.

The six-file diff preserves dist/mcp-server.js byte-for-byte from the base because indexing and sync are outside its native input graph. There is no dependency upgrade. Earlier resolver/signing failures remain historical evidence and do not qualify other runtimes.

The fork workflow still needs maintainer approval. The consolidated request on #180 covers this PR. Merge, release and installed-user acceptance remain pending.

[HengYangDS]

CI for this append indexing fix still awaits approval. The request on #180 has the current head and run link. Local validation remains in this PR’s description; hosted execution and installed use are unverified.