SQLAlchemy can't resolve ambiguous FK paths when tables have
multiple cross-references. All relationships now specify foreign_keys.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Introduces the session_resolution_outputs table for the three resolve
deliverables (psa_ticket_notes, knowledge_base, client_summary) with
UNIQUE(session_id, output_type) for safe upsert on regeneration.
Also registers SessionBranch, ForkPoint, SessionHandoff, and
SessionResolutionOutput in models/__init__.py so Alembic and the app
pick them up automatically.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
