Fix missing greenlet in production migration runtime

[JoshCLWren]

Deploy Production fails at Alembic environment loading because the locked SQLAlchemy 2.1 runtime omits greenlet. Declare sqlalchemy[asyncio] in the production dependencies and update the lockfile so both migrations and the async application install it.

Add a separate PR CI job using the exact production install (uv sync --locked --no-dev) to import the async models and migrate a fresh PostgreSQL database. Include this job in CI Summary, lock the dependency contract with regression coverage, and document why dev installs can mask the failure through Playwright.

The full local push validation also exposed inherited Git hook settings breaking temporary-repository tests. Clear repository-local Git environment before the pre-push gates and add a regression test; all existing gates remain enabled.

Validation:

• Reproduced the original missing-greenlet failure with the production install before the fix.
• Production-only install and imports passed; all migrations applied to an empty PostgreSQL database at d1aa29806941.
• Project-only install (uv sync --locked --no-default-groups) passed an async PostgreSQL query.
• Dependency audit plus hook isolation and backup guard regressions: 20 tests passed.
• Whole-repository ruff check . and ty check --error-on-warning passed.
• Frontend typecheck and production build passed.
• Full local push validation is still running (backend suite past 83% with no failures); branch pushed with --no-verify at Josh's explicit instruction while checks continue.

Addresses #2965. Keep the issue open until a subsequent main Deploy Production run confirms migration and deployment success.

Closes #2967.

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✅ All modified and coverable lines are covered by tests.

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