[quickbeard]

Two commits: a one-time formatting cleanup, and the hook that stops the drift from coming back.

1. chore: format fork-touched files with prettier

Ran prettier --write over every file this fork adds or modifies relative to upstream v1.18.4 (the tag in packages/opencode/package.json). Of the 705 prettier-eligible fork-touched files, 67 were unformatted; the rest were already clean.

Why this is safe to do to upstream files. The formatting drift is entirely fork-authored. I extracted the upstream v1.18.4 version of each of the 34 modified-upstream files in the unformatted set and checked them: all 34 are prettier-clean upstream. So this restores upstream's own formatting conventions on regions the fork edited, which shrinks conflict surface on the next sync rather than adding to it. No new divergence is introduced by the formatting itself — these files already diverge; only their whitespace changes.

Exclusion: packages/web/src/content/docs/. Added to .prettierignore, with the reasoning inline and the existing .prettierignore row in DIVERGENCES.md extended:

• It is the upstream docs merge base (packages/web/FORK-DOCS.md). Nothing in this repo builds it; its whole job is to make upstream doc changes surface during a sync. Reformatting it is pure conflict surface for zero user-facing benefit — the published docs live in codev-landing-page.
• Prettier's MDX printer actively mangles index.mdx, collapsing the fenced code blocks inside <TabItem> into inline text.

2. chore: format staged files with lint-staged on commit

The drift above accumulated because nothing enforced formatting — the only hook was pre-push, and it runs bun typecheck alone.

• .husky/pre-commit (fork-only; upstream ships pre-push only) runs bunx lint-staged.
• Root manifest gains a lint-staged block mapping every staged path to prettier --write --ignore-unknown, plus the lint-staged devDependency.
• --ignore-unknown skips paths Prettier has no parser for (bun.lock, .husky/*, binaries) instead of failing the commit; .prettierignore still exempts DIVERGENCES.md and the docs merge base.

DIVERGENCES.md rows updated for the root package.json and bun.lock.

Verification

• prettier --check over the full fork-touched set: clean, and a rerun of --write over the PR's own files is a no-op (idempotent).
• bun turbo typecheck: 33/33, including via the pre-push hook.
• Touched test files re-run and passing (packages/tui util/routes tests, packages/opencode provider transform: 386 tests).
• Hook exercised end-to-end with a deliberately unformatted staged file — reformatted and re-staged, and the resulting commit contained the formatted version. Confirmed on this PR's own commit that DIVERGENCES.md passed through untouched.
• All non-whitespace hunks reviewed — line reflow, trailing commas, and *em* → _em_ only.

No behavior change, so no CHANGELOG.md entry.

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