Follow-up to the status SSoT (#382): analyst_verified + research_complete are
now first-class canonical statuses, so refresh the docs that still framed them
as legacy/decorative.
- HEARTBEAT.md §7: rewritten to point at the single source
(case_status_model.py / GET /api/status-model), list the 12 canonical statuses
by phase, and state the two intermediates are canonical (not legacy); genuinely
old markers (proofread/analysis_enriched/…) are display-only fallbacks.
- legal-qa.md / legal-ceo.md status maps: dropped the "legacy/optional" framing
on research_complete; point to the canonical model.
- scripts/backfill_case_status_trim.py: removed analyst_verified +
research_complete from the downgrade map (they are valid statuses again — must
NOT be downgraded) + updated the docstring.
Docs/prompts only — no behaviour change. py_compile clean.
NOTE: the host ~/legal-ai needs `git pull` for the Paperclip agents to pick up
the refreshed prompts (they run on the host tree, not the container).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>