chore(release): prepare 0.18.0

[benvinegar]

Summary

• promote hunkdiff from 0.18.0-beta.0 to stable 0.18.0
• consume the 0.18 changesets and generate the stable changelog, including the changed-file count and current-line performance fixes
• commit the five-sample bench-0.18.0.json release benchmark snapshot
• route stable promotions that remove .changeset/pre.json through the normal Changesets status gate, with regression coverage

Benchmark gate

The release benchmark gate passes with two documented accepted regressions:

• highlight-prefetch/selected_startup_ms: samples remain split between scheduler-dependent ~9 ms and ~21 ms clusters, while adjacent readiness passes every sample and next-file readiness improves
• wrapped-cjk/wrapped_cjk_518_mount_first_frame_ms: the default current-line cursor now paints synchronously in the first frame; content completeness and wheel latency pass, and the pathological long wrapped-line metric remains below the gate's absolute threshold after fix(ui): bound current-line navigation costs #685

Navigation latency is slightly faster than 0.17.7, and navigation heap remains within the release threshold after #685.

Validation

• bun run typecheck
• bun run lint
• bun run format:check
• bun run check:pack
• bun run test:theme-contrast
• CI-equivalent unit suite — 1,945 passing, 9 skipped
• bun run test:integration — 97 passing
• bun run test:tty-smoke — 9 passing
• real-TTY source diff smoke run
• bun run bench:release:compare
• bun run ./scripts/check-release-version.ts v0.18.0
• bun run ./scripts/verify-pr-release-notes.ts origin/main HEAD
• independent release-diff review — no blockers

This PR description was generated by Pi using OpenAI GPT-5.6-sol

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Project	Deployment	Actions	Updated (UTC)
hunk-web	Ready	Preview	Aug 8, 2026 1:57pm