v0.28.0 — **Phase 3 begins**

Added — T-301 strat_config editor

• analysis/strat_config.py — canonical JSON shapes + validators + CRUD helpers. Decisions captured 2026-05-24:
  • mit_plan = structured slots: {slots: [{ability_id, expected_role, window_offset_ms}, …]}. expected_role is one of the 8 FFXIV roles (MT/OT/H1/H2/D1/D2/D3/D4), "any", or null.
  • assignments = role-based: {role_map: {slot_name: role}} where role is in the same set.
  • mechanic_ref = compound "{ability_game_id}_{occurrence_idx}" — explicitly per-occurrence so Akh Morn x4 can carry distinct mit plans per cast (user noted recurring mechanics don't necessarily share mit plans).
• Schema reuses the existing strat_config table (T-003 created it). No migration needed.
• API: GET /api/encounters/{id}/strat-config (list + role catalog), GET .../{mechanic_ref} (one), PUT .../{mechanic_ref} (upsert), DELETE .../{mechanic_ref}. All validation errors return 422 with detail.
• React StratEditor.jsx mounted as a third sub-tab in Encounters (alongside Fight map / Compare):
  • Mechanic picker on the left — defaults to raidwide/tankbuster/aoe_party/enrage (the ones likely to need a strat), "show all mechanics" toggle for the full list. Configured mechanics get a ★ marker.
  • Per-mechanic editor on the right — mit-slot table (ability dropdown sourced from T-108's mit_party/mit_self/mit_boss_debuff labels), assignment table for slot_name → role. Save / Delete buttons; per-save status pill.
• 18 new tests (9 pure-function: encoding/decoding/validation; 9 API: CRUD + compound-key separation + replacement + 404 + validation errors). 231 tests total.

Scheduled

• T-309 Drag-and-drop visual strat editor — polish on T-301's form-based editor. Captured in IDEAS.md + scheduled in PLAN §11 Phase 3 (not gating 1.0.0). Defer until T-301's form-based editor proves to be the bottleneck.