Replace the scaffold with clean V1 jobs

[ferueda]

Summary

• replace the walking-skeleton runtime with the clean V1 SQLite schema
• remove scans, observations, old worker contracts, and the content_ideas projection
• store event subject and job version/configuration identity directly on authoritative rows
• match one retained analysis.completed event into one deterministic complete V1 job
• add local subscription matching and V1 job and artifact inspection

Review path

1. Start with internal/adapters/sqlite/migrations and database.go for the clean cutover.
2. Read internal/application/subscription_matcher.go and content_scout_registry.go for event-to-job behavior.
3. Read internal/adapters/sqlite/v1_job_store.go and agent_runtime_store.go for insertion and inspect-then-claim.
4. Read cmd/noema/subscriptions.go for the local CLI surface.
5. Use the focused SQLite, matcher, and CLI tests for idempotency and failure behavior.

Boundaries

This slice is fully local. It does not invoke Eve, require credentials, call a model, dispatch a job, or preserve pre-V1 databases. Pre-V1 databases must be recreated.

Verification

• make check on the rebuilt slice

Stack

Based on #21. Merge and reconcile the parent PRs first.

[ferueda]

Superseded by #20. The useful pre-V1 scaffold removal will be reimplemented from main together with consumer-neutral events and the transactional outbox. The job queue, subscription matcher, and agent runtime in this PR are outside Noema's boundary.