v0.46.0 — compact admission and editor contracts

Highlights

• Compact parser admission is ratcheted at 166 byte-exact routes out of 206 fixtures, with 35 fail-closed fallbacks and 5 token-source skips.
• Certified collapsed named leaves now materialize natively; compatibility passes have explicit ownership, witnesses, and retirement criteria.
• The editor gate now covers Go, JavaScript, TypeScript, Python, and CSS across insert, delete, and replace edits at start, middle, and end for roughly 20 KiB and 137 KiB sources, plus a manual 1 MiB tier.
• JavaScript and TypeScript transient-error deletes have deterministic parser-work, retry, stack, node, and memory bounds while remaining structurally equal to fresh parses.
• All 119 registered external scanners have a published, drift-tested incremental-reuse contract. SQL, HTML, and Markdown explicitly fail closed to the production full-parse path after the narrow token-invariant leaf exception declines.
• Incremental documentation now states the measured cost model: cheap edited-region parse work plus linear coordinate maintenance for affected trailing siblings, not an absolute O(edit) guarantee.

Evidence

• PR #428: #428
• Final-SHA CI, including root race and exhaustive cgo parity: https://github.com/odvcencio/gotreesitter/actions/runs/29892883776
• Manual full editor gate, 20 KiB / 137 KiB / 1 MiB: https://github.com/odvcencio/gotreesitter/actions/runs/29892922471/job/88836872560

Known limits

• Uncertified or explicitly opted-out external scanners retain the documented production full-parse fallback.
• JavaScript and TypeScript leading-prefix splice proof remains conservative for some middle and end edits; the new gates bound this behavior rather than claiming it is eliminated.
• Performance improvement beyond the ratcheted correctness and memory band remains ongoing work rather than a release gate.