fix: preserve lockfile graph during versioning

[jan-kubica]

Summary

• synchronize cached Bun workspace self-versions without regenerating the resolved dependency graph
• make Changesets versioning use the synchronizer followed by a frozen install
• gate CI with the same code in check-only mode
• add executable invariants and generated repository guidance that prohibit lockfile deletion during versioning

Validation

• real @stll/oxlint-config 0.4.0 → 0.4.1 → 0.4.0 round trip; both frozen installs passed and bun.lock returned byte-identical (SHA-256 eb37eb7bddb3c7075fc9ae90d5a8f08cb0f02ed4202ad64ee431308a93e52fcb)
• bun run typecheck
• bun run test
• bun run lint
• bun run publint
• bun run pack:dry-run
• bun run test:rust-lints

CC on behalf of @jan-kubica

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 20d778bf-857b-4ae0-be3a-85ccc0e6899a

📥 Commits

Reviewing files that changed from the base of the PR and between 93ddf6c and 76c80e1.

📒 Files selected for processing (7)

• .ai/local/agents.md
• .github/workflows/ci.yml
• AGENTS.md
• package.json
• scripts/bun-lock-workspace-versions.test.ts
• scripts/check-lockfile-workspace-versions.ts
• scripts/lib/bun-lock-workspace-versions.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/changeset-lock-safety

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