docs: archive PRD, gate map in AGENTS, drop PM-DESIGN

Move PRD to docs/archive/PRD-2026-08.txt with superseded header.
Rewrite live references. AGENTS gains Gate A/B/C table, freeze
provenance, open-doc-defects slot, and archive rank. README/TECH-SPEC
/ARCHITECTURE de-dupe. DoD green: delete PM-DESIGN-ALIGNMENT.

README.md

@@ -6,41 +6,52 @@ Phone capture (online) → hybrid measure/crop on device → review → WooComme
 Owner: Ty (Whidbey). Store: www.whidbeywoodstore.com. Deploy: Docker Compose + Caddy on an inventoried host (`APP_HOSTNAME`).
 
 ## Status
-**POC requirements freeze in progress (Gate A, 2026-08-31).** Read `AGENTS.md` before
-any implementation. TECH-SPEC + ARCHITECTURE beat stale PRD/README lines. Do **not**
-treat older “planning complete / ready for implementation” wording as a green light
-to code the obsolete server-pipeline Phase 0.
+
+**Gate A freeze signed 2026-08-31.** Docs refactor on branch `docs/refactor-v2` (2026-09-01).
+Read `AGENTS.md` before any implementation. TECH-SPEC + ARCHITECTURE + AGENTS beat archived PRD lines.
 
 POC bar: phone → customer-ready listing on the real store; UAT creates as **Woo draft**
 with `SLAB-UAT-*` SKUs; one real SKU **Woo publish** after Ty review. Online-only for POC
-(offline deferred). Build plan: `docs/IMPL-PLAN.md` (Phase 0 = hybrid Gates A+B).
+(offline deferred). Build plan: `docs/IMPL-PLAN.md` (Phase 0 = hybrid Gates A+B; Gate C =
+early Phase 1 first draft listing).
 
 ## Documentation
+
 | File | What |
 |---|---|
 | `AGENTS.md` | Working contract + hard rules (read first) |
-| `Slab capture app PRD.txt` | Requirements + decisions (intent; superseded lines called out in AGENTS) |
 | `docs/ARCHITECTURE.md` | Hybrid client/server split, data flow |
 | `docs/TECH-SPEC-PIPELINE.md` | Deterministic math + image pipeline, constants, test vectors |
 | `docs/DATA-MODEL.md` | SQLite schema + slab status state machine |
 | `docs/OPENAPI.md` | Client↔server API contract |
 | `docs/CONTENT-WOO.md` | Content templates + WooCommerce payload/integration |
 | `docs/PROMPTS.md` | Vision + content prompts (server files) |
-| `docs/DEPLOYMENT.md` | Compose, Caddy, backup/restore, key rotation |
+| `docs/DEPLOYMENT.md` | Env-agnostic compose, Caddy, backup/restore |
+| `deploy/INVENTORY.md` | Host inventory worksheet (Gate B) |
 | `docs/IMPL-PLAN.md` | Phased build plan with acceptance criteria + exit gates |
+| `docs/archive/PRD-2026-08.txt` | Frozen historical PRD only (not a source for new work) |
 
 ## Quick orientation
+
+Hard locks live in `AGENTS.md`. Short map:
+
 - **Hybrid:** phone owns mask/sliders/sqft/bdft/3:4 PNG; server stores, Woo, inference proxy, on-demand U2Net.
-- **Deterministic core** is unit-tested and network-free. Inference is toggleable; app works with it off.
+- **bdft** = sqft × thickness_in (no `/12`). TV-1 through TV-10 on the client.
+- **Secrets** never in browser; AES-GCM on server; `SLAB_AES_KEY` env only.
+- **Woo UAT:** draft default; `SLAB-UAT-*` force draft (AGENTS §5).
+- **Inference OFF** until Gate C; Call 1/2 after, still inside POC.
 - **Online-only for POC** (offline PWA deferred).
 - **Two containers** (`frontend`, `fastapi`) + Caddy. Single SQLite + image volumes.
 - **v1 non-goals:** no versioning, no staff/roles, no bulk publish, no analytics, no SKU update path.
 
 ## Repo remotes
+
 - Canonical SoT: Gitea `Ty_Tech/SlabUploader` on **gitea-atd** (`https://gitea.vps1.afterthedemo.com/Ty_Tech/SlabUploader`)
 - Optional later mirrors: `gitea-truenas`, GitHub — not SoT for this workstream
 
 ## Getting started (implementer)
+
 1. Read `AGENTS.md` (hard rules) and Phase 0 in `docs/IMPL-PLAN.md`.
 2. Start at Phase 0 — hybrid client TECH-SPEC modules + thin FastAPI health/settings (not a server happy-path pipeline).
 3. Do not skip exit gates; Ty signs each phase via the delivery process.
+4. Do not implement from `docs/archive/PRD-2026-08.txt`.