fix(core): refuse to start against a database migrated by a newer version

[CreatorGhost]

Port of upstream anomalyco/opencode#36429.

Startup now compares the database's applied migration count against the binary's known migrations and fails fast with a clear error when the DB is ahead (i.e. was migrated by a newer version), instead of running against a schema it doesn't understand and corrupting state.

Verified: bun test test/database-migration.test.ts (17 pass) and bun typecheck from packages/core. Applied cleanly.

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d106fe93-d11f-47da-9599-503e65643abf

📥 Commits

Reviewing files that changed from the base of the PR and between 67e2bd4 and 4390bcc.

📒 Files selected for processing (2)

• packages/core/src/database/migration.ts
• packages/core/test/database-migration.test.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch db-version-guard

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