Migration 0002 adds two tables off the canonical CDC path:
- projects: durable registry of managed repos (the twin of the old YAML
config). Soft-deletable via archived_at so a session's project_id always
resolves; ListProjects returns active rows only, GetProject resolves any.
- pr_enrichment: per-session cache of rich SCM facts (CI summary, review
decision, mergeability, pending comments, CI log tail) that do not live
in the canonical lifecycle. 1:1 with a session, cascades on session delete.
Both are written outside the LCM write path: no revision bump, no
change_log/outbox event. Store methods mirror the reaction_trackers adapter
pattern with storage-local row structs.
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