Smoke run analysis initially flagged three Task fields as unused
(pm_approvals, quick_context, proactive_context). A follow-up audit
found quick_context (stores original_developer marker + doc notes +
PR creator + escalation notes) and proactive_context (RAG injection)
are actively used. Only pm_approvals is truly orphaned.
Migration 014 drops pm_approvals; downgrade() recreates it if ever
needed. The two false-positive fields stay untouched.
Spec ref: docs/superpowers/specs/2026-05-12-post-smoke-3-fixes-design.md
section B2 (re-scoped 2026-05-12).
