fix(meta): prettier and eslint skip other sessions' worktrees under .claude/worktrees/

[PrzemekGalarowicz]

Summary

A bare npm run format:check or npm run lint in a main checkout read every other Claude Code session's worktree under .claude/worktrees/<name>/. On 2026-09-28, with 9 sibling worktrees present, npm run check failed format:check with hundreds of [warn] lines, all for files inside those worktrees. They are excluded through .git/info/exclude, which prettier does not read, and ESLint 10's flat config does not skip dot-directories.

• .prettierignore gains .claude/worktrees/.
• eslint.config.mjs's global ignores gains .claude/worktrees/**.
• Each entry has a comment matching the existing .markdownlint-cli2.jsonc .claude/worktrees entry: the reason, and the bound (tied to where Claude Code places worktrees today).
• CHANGELOG.md: one dated ## [Unreleased] entry. Repo-meta only, so SKILLS_VERSION does not move.

This closes the prettier half that 6.13.1 measured and deferred.

Verification

A probe at .claude/worktrees/probe/ held a copy of HEAD plus a badly formatted .md and a .mjs with two lint errors.

	format:check	lint
Before	exit 1, 64 files (the 2 probe files + 62 committed files the root .prettierignore excludes only at the root)	exit 1, 2 errors in the probe .mjs
After	exit 0	exit 0
Negative control: same files at repo root	exit 1 (2 files)	exit 1 (2 errors)

The probe was removed afterwards. check:changelog-entry is GREEN against origin/main.

Full npm run check did not go green locally, for two reasons outside this change:

• In the authoring worktree it stops at check:reconcile. That worktree directory was reused, and it still held a leftover reconcile baseline from another feature (2026-09-27). All 129 of its unexplained flags were changed by commits merged since that anchor, and the other 2 are this PR's config files. CI has no baseline.
• In a clean copy, every gate through check:reconcile passed. npm test had 1 failure out of 4256: pharn/floor/run-marker.test.mjs:564, which fails only on macOS (/var vs /private/var). It fails the same way on untouched origin/main, and it is being fixed in a separate session.

Not claimed

• No test pins either new entry, unlike the markdownlint one in command-hygiene.test.mjs, so nothing stops one being removed.

🤖 Generated with Claude Code

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Important

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⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 25f90d78-3e30-489e-af67-cfd240b3b45c

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