ci(fork-patches): add typecheck + serialized server CI lane (FLO-520)

[Fl0p]

What

Adds .github/workflows/fork-patches.yml — a minimal, self-contained CI lane for the fork-patches integration branch. Runs on push/pull_request to fork-patches:

• Typecheck — pnpm run typecheck (full pnpm -r typecheck + workspace-links preflight).
• Serialized server tests — pnpm test:run:serialized, 4 shards, embedded-postgres, on x86 ubuntu-latest runners.

Uses --frozen-lockfile, which doubles as a lockfile-consistency check.

Why (FLO-520, follow-up from FLO-518)

pr.yml only triggers on pull_request -> master. A fork-patches -> master PR spans ~300 commits and carries pnpm-lock.yaml changes, so the pr.yml policy job's manual-lockfile-edit guard fails, and every needs:[policy] job — including the DB-backed verify_serialized_server suite — is skipped. Net effect: patches landing on fork-patches got no CI.

This lane deliberately does not re-run the pr.yml policy/lockfile-guard machinery; the committed pnpm-lock.yaml is authoritative on fork-patches.

Verification

• YAML parses; jobs = typecheck, serialized_server (4 shards); triggers = push + PR on fork-patches.
• pnpm run typecheck and pnpm test:run:serialized both exist in package.json and are the same commands proven green in release-verify.yml.
• Step blocks mirror the proven release-verify.yml / pr.yml lanes.
• Not runnable locally: maintainer host is ARM; these checks need x86 + embedded-postgres (the whole point of the ticket).

Note

paperclip is a special repo — merge needs board owner approval. Handing off rather than self-merging (CI config is review-required surface).

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch flo-520-fork-patches-ci

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[Fl0p]

Closing per board decision on FLO-520 (request_confirmation rejected): the fork-patches CI lane is not wanted. No changes landed on fork-patches; feature branch deleted.