fix(git): stop implicitly linking .claude

[richardsolomou]

Problem

Worktrees implicitly share the main checkout's writable .claude directory. That leaks task-local state across worktrees and can leave an absolute local symlink staged in the generated checkout.

Changes

• I made .claude sharing opt-in through .worktreelink while keeping CLAUDE.local.md linked automatically.
• I changed local exclude matching to compare exact patterns, so a nested entry like **/.claude/worktrees/ cannot mask a missing .claude exclude.

How did you test this?

• pnpm --filter @posthog/git exec vitest run src/worktree.test.ts src/queries.test.ts (58 passed)
• pnpm --filter @posthog/git typecheck and pnpm --filter @posthog/git build
• pnpm --filter @posthog/git test (327 passed; unrelated checkpoint conflict fixture failed)

Automatic notifications

• Publish to changelog?
• Alert Sales and Marketing teams?

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Created with PostHog Code

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[github-actions]

React Doctor found no issues in the changed files. 🎉

_{Reviewed by React Doctor for commit 63d394d.}