docs(phase2): reconcile requirements and migrate capabilities/contracts

Surface-matrix sweep of every source doc; added nine missed behaviors (METADATA-115, REVIEW-50, APP-55/60/65, SETTINGS-45 mode, Generate-text availability, defaults-off). 153 requirements, 0 coverage gaps.

Migrated capabilities to docs/capabilities/ and contracts to docs/contracts/; added WOO-API, API, DATA-MODEL, PROMPTS, UX, TEST-SPEC. Populated MILESTONES; branch-neutral trunk docs; renamed umbrella term to Woo Slab Taxonomy. Archived reconciliation working records under .audit/archive/.

docs/contracts/README.md

@@ -4,13 +4,14 @@ Cross-cutting interface detail shared by capabilities.
 
 Rules (`docs/STRUCTURE.md`): a contract doc **cites** requirement IDs from `docs/REQUIREMENTS.md`; it never defines or restates them.
 
-Expected files (Phase 2 migration):
+Contract docs (migrated):
 
+- `WOO-API.md` — external WooCommerce REST API v3 surface (new; the dependency contract)
 - `API.md` — FastAPI HTTP contract (from tag `OPENAPI.md`)
 - `DATA-MODEL.md` — SQLite schema and status machine (from tag `DATA-MODEL.md`)
 - `UX.md` — screens, field recovery, outcomes (from tag `UX.md`)
-- `PROMPTS.md` — Call 1 / Call 2 prompt text (from tag `PROMPTS.md`)
-- `TEST-SPEC.md` — test pyramid, vectors, dishonest proxies (from tag `TEST-SPEC.md`)
-- `CONTENT-WOO.md` — listing copy and Woo payload detail (migrated from `docs/CONTENT-WOO.md`)
+- `PROMPTS.md` — Call 1 / Call 2 prompt text and inputs (from tag `PROMPTS.md`)
+- `CONTENT-WOO.md` — listing copy and Woo payload intent (from `docs/CONTENT-WOO.md`)
+- `TEST-SPEC.md` — test pyramid, vectors, dishonest proxies (from tag `TEST-SPEC.md`) — pending
 
 Template: `docs/_templates/contract.md`.