docs: ratify PRD rev1 — consolidated bundle, permanent shim, rev0 archived

Ratifies the Mosaic Stack PRD rev1 (Jason Woltje, 2026-09-01) as project
source of truth and installs the GOV.1 lifecycle model:

- docs/PRD.md becomes a permanent shim (kind: shim, current_rev ->
  docs/PRDs/2026-08-31_PRD_rev1/). Its path never changes again.
- docs/PRDs/2026-08-26_PRD_rev0/PRD.md archives the 2026-08-26 North Star
  verbatim (sha256 60cc2f98...36afdf unchanged). Archive, never delete.
- docs/PRDs/2026-08-31_PRD_rev1/ is the frozen rev1 bundle: 18 sectioned
  documents (VIS, DATA, AUTHN, AUTHZ, SEAT, ROLE, HARN, PROV, SESS, UI, CLI,
  GOV.1-5) consolidating rev0 D1-D15, the fleet north star, the agent-runtime
  L1/L2 contracts and the control-plane-surfaces lane findings, with a single
  decision map (GOV.3) and a closed open-questions frontier (GOV.5, grill
  rounds 1-8). Drafting inputs (_source-* snapshots) are not shipped.

Consequences of the ratified rulings carried in the same change:

- Q-T1 (ruling B, "shipped but frozen"): D3 amended in GOV.3/VIS.1;
  federation M1-M3 acknowledged as shipped behind tier === 'federated',
  excluded from the v1 bar and frozen, with a security re-audit gate before
  any resumption. docs/MISSION-MANIFEST.md, docs/federation/MISSION-MANIFEST.md
  and docs/scratchpads/mvp-20260312.md get status: superseded + banners
  (content preserved verbatim); docs/guides/deployment.md gains a
  "Relationship to the PRD (D15)" section. NORTH_STAR.yaml adds dormant
  workstream M (projects no goals by design); NORTH_STAR.md regenerated.
- Q-G2 (distinct registry prefixes): every citation of the operator
  DECISION-REGISTER in the bundle reads OD-nn; the stack registry stays
  D1-D15; L1-Dnn/L2-Dnn untouched. Prefix rule recorded in GOV.1.

Follow-ups (not in this PR): CI parity drift-gate witness (Q-C1); brain-side
DECISION-REGISTER rename to OD- with redirect table on its next touch.

docs/federation/MISSION-MANIFEST.md

@@ -1,8 +1,10 @@
 ---
 kind: tracking
-status: active
+status: superseded
 ---
 
+> **Superseded (2026-09-01, PRD rev1 ratification).** This document's framing of Federation v1 as an active, in-progress mission (M3) is historical. Federation M1–M3 are shipped but **frozen** (dormant since 2026-06-25, excluded from the v1 bar, security re-audit gate before any resumption); the canonical v1 deployment topology is the compose standalone tier (PRD rev1, D15). Authority: `docs/PRD.md` → `docs/PRDs/2026-08-31_PRD_rev1/` (decision D3 as amended, GOV.5 Q-T1). Tracking: `docs/fleet/NORTH_STAR.yaml` (dormant federation workstream). Content below is preserved verbatim as a record — do not edit it.
+
 # Mission Manifest — Federation v1
 
 > Persistent document tracking full mission scope, status, and session history.