v0.2.0 - Pipeline Registry

Adds registered pipeline definitions so operators can connect live run status to ownership, stale-run thresholds, and runbooks.

Added

• Pipeline registry table and migration
• Registry API for creating, listing, reading, and updating pipeline definitions
• Ingestion API-key protection for registry write endpoints
• Per-pipeline stale thresholds in stale-run metrics
• Registry context in the operations dashboard
• Sample registered pipelines in seeded demo data
• Documentation for the registry workflow
• Project version bump to 0.2.0

Validation

• python -m ruff check .
• python -m mypy app
• python -m alembic upgrade head
• python -m pytest
• git diff --check
• Dashboard smoke test at /dashboard