docs(changelog): record the tree cache and boundary prune

2026-08-17 13:03:16 -07:00
parent 9169ac5c52
commit 0e9f4dab52
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 ## [Unreleased]

+### Changed
+
+- `enclosingBlockBoundaries` and `blockRangeAt` now reuse a parsed tree-sitter tree when the same source and language were parsed before, and skip subtrees whose line span holds no visible line. Together these cut the block-context work the `read` tool performs on every non-raw read: for an 81KB TypeScript source with a mid-file window, 13.4ms to 4.45ms on a first parse and to 0.149ms once the tree is cached; for a 1.06MB source, 188.1ms to 55.8ms and to 0.440ms. The tree cache is bounded (12 entries, 4MiB of retained source) and verifies content byte-for-byte on every hit, so a hash collision can only cost a re-parse. The subtree skip is proven equivalent by differential comparison against the exhaustive walk across 4827 repository files and 38,616 window comparisons.
+
 ## [17.3.5] - 2026-08-16

 ### Fixed