feat(incremental): incremental re-scan + scan --update/--watch (6.1, D1/G2)

[officialCodeWork]

Phase 6.1 — Incremental re-scan (failure modes D1, G2) · completes Phase 6 / Gate 6

Re-scan only what changed, with a graph provably byte-identical to a full re-scan.

Design

• scanReact split into createScanProject (build + load the ts-morph project) and scanProject (the full analysis).
• New IncrementalScanner keeps one project alive. update() calls refreshFromFileSystemSync on each source file — ts-morph re-parses only files whose bytes changed — picks up added files, drops deleted ones, then re-runs scanProject.
• Correctness by construction: every node and cross-file edge is re-derived from the current ASTs on each update, so an update's graph is byte-identical to a fresh full scan. The hard "dependents" problem (a changed component's parents' instance/prop-flow attribution, store/route/journey wiring) is handled for free because the global passes always re-run; the incremental win is parsing (unchanged files keep cached ASTs).

Provenance & CLI

• GraphMeta.fileHashes (relative path → sha256; schema regenerated, drift gate green); projectFileHashes computes it.
• scan --update: short-circuits when every file hashes identically to the prior graph (else reports the changed set and full-rescans — correct, ~2 s at scale).
• scan --watch: re-emits the graph on each debounced file change (ignores the output file, node_modules, .coderadar).

Tests

• Property test: an interconnected app (pages → components → atoms + hook, cross-file imports/fetches) stays byte-identical to a full re-scan across 20 randomized single-file edits (rendered text / endpoint / re-pointed cross-file import), plus add-file and delete-file cases with exact changed reporting.
• Verified end-to-end via the CLI (--update no-change/changed, --watch live edit).

Also

Strips a stray NUL byte that shipped in the 6.3 edgeSortKey join separator (now the intended space) — functionally inert (both are valid separators) but it flagged the file as binary in git.

Verification

• pnpm eval → 317 pass · determinism 1.000
• parser-react 151 tests; full suite, typecheck, lint green.

Gate 6 passes (6.1 incremental · 6.2 scale · 6.3 determinism · 6.4 version-skew · 6.5 generated/PII). M6 reached — production-grade: incremental, fast, deterministic, versioned. Tracker + milestone table updated.

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