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perf(streaming): single-pass reuse array; dedupe startsWith scan (#349)

* perf(streaming): single-pass reuse array; dedupe startsWith scan

Part A (streaming-token-reuse): replace slice(0,n).concat(slice(n))
with a single preallocated fill so the common "only the tail diverged"
flush no longer materializes two intermediate slice arrays each frame.

Part B (incremental-parser): compute the append-only fact once via
isAppendOnlyUpdate and thread it into canUseTailWindow/parseSource so
source.startsWith(prevSource) runs a single time per update instead of
being recomputed inside the tail-window check.

Behavior-preserving; existing streaming-token-reuse and
incremental-parser suites unchanged. Resolves #332 residual.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* docs(guard): log 007 checkpoint 1 — ON TRACK

Guard oversight record for plan 007 (streaming hot-path micro-opts).
Both Part A (single-pass reuse array) and Part B (dedupe startsWith)
verified in-tree at d7addea: all Done criteria reproduced, positional
-arg trap audited clear, no test weakened or out-of-scope file touched.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* docs(guard): close out 007 — PASS, PR #349 opened

Final guard gate for plan 007 (streaming hot-path micro-opts). All Done
criteria re-run green at snapshot d7addea; Part A proven byte-identical
and Part B semantically identical; scope clean, plan untampered, no STOP
skipped. PR #349 opened for the reviewed snapshot — merge is operator's call.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* docs(incremental-parser): add JSDoc to isAppendOnlyUpdate helper

Carry the file's JSDoc convention onto the new isAppendOnlyUpdate helper
(@param/@returns/@example), matching the sibling private helpers and the
src/lib/utils/*.ts path instruction. Addresses CodeRabbit review on #349.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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