fix(hooks): wipe TS project emit on branch checkout

[patroza]

Why

pnpm check is tsgo --build. Package dist/ + .tsbuildinfo are gitignored and can outlive a branch switch, causing phantom type errors that vanish on pnpm rbuild. Same class as scanner#2166.

What

• Add .githooks/post-checkout: wipe packages/*/dist (and stray *.tsbuildinfo) on every branch/worktree checkout, then reconcile pnpm when lockfile changed
• Document in .githooks/README.md
• chmod hooks in install-git-hooks.mjs
• Hook unit test under scripts/hooks/

How

Checkout flag 1 only; file-only checkouts leave dist alone. Incremental same-branch tsgo -b remains the fast path for pre-push.

Remarks

• Workaround until upstream invalidation is solid (typescript-go #2666, #4664, #4262)
• Do not re-enable cross-tree dist reuse without exact source-identity keys

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commit: d38e4b0