docs(P00): validate specification — v1.21 milestone (REQ-245..253)

Add v1.21 requirements section (Nova Deck Refinement & Pipeline Hardening):
REQ-245 deck rename + restructure; REQ-246 thesis rename + reframe;
REQ-247 strategic-docs sync (integration objective); REQ-248 RACI
restructure (QE + SRE); REQ-249 Atelier split; REQ-250 pipeline hardening
(Checkov before plan, Wiz-or-Checkov on plan); REQ-251 theme CSS fix +
footer cleanup; REQ-252 global citation/badge/version removal; REQ-253
render + verify + ship.

Set active_milestone=v1.21 in config.json. Sync PROJECT.md strategic-
direction pillar for the integration objective (Objective #4 reframed),
deterministic-trust reword (Objective #2), CTO-grade ROI metrics
(Objective #3), and anti-goal updates.

---ci---
project: acdl
phase: 0
milestone: v1.21
status: specify
---/ci---

.ciagent/PROJECT.md

@@ -1266,16 +1266,29 @@ P7 review+audit+ship). Tags on the v1.16.x line: `v1.16.0` (P0) →
 
 - **Pillar A — Strategic Direction.** A durable, PO-authored
   `.ciagent/NORTH_STAR.md` encodes the platform's vision, 4 strategic
-  objectives, 5 anti-goals, v1.17 non-goals, 12–18mo targets (with a
+  objectives, anti-goals, v1.17 non-goals, 12–18mo targets (with a
   grounding column), and success criteria. CIAgent reads it in every
   future `/ci-run` so the direction survives across milestones. The
   attestation clarification is reflected: human attestation required at
   stage gates (QA for production, SRE for operational readiness); autonomy
-  in operations, not in accountability.
+  in operations, not in accountability. **v1.21 refinement:** Strategic
+  Objective #4 reframed from "default substrate for agentic consumption" to
+  integrating with externally owned PDLC/SDLC/Agentic/Citizen Developer
+  platforms regardless of source (Nova provides skills + MCP endpoints;
+  all prod intents go through the same controls). Objective #2 reworded:
+  trust is established by deterministic scripts that calculate a score —
+  the platform functions without AI. Objective #3 reworded with four
+  CTO-grade metrics (Lead Time PR→Prod, Infrastructure Vulnerability
+  Count trend, MTTR, Cloud Spend Reduction) all flowing into PowerBI.
+  Anti-goals #1, #4, #5 removed; replaced with "not an upstream
+  development platform" and "not a replacement for the PDLC".
 
 - **Pillar B — Leadership Metrics + PowerBI.** Instrument Nova to
   collect, aggregate, and surface leadership-grade metrics that prove the
-  "no-humans" autonomous-infrastructure value proposition. Nova-native
+  "no-humans" autonomous-infrastructure value proposition (reframed in
+  v1.21 to "autonomous cloud delivery" — professional framing; the
+  platform delivers safe production deployment without an operator in
+  the loop of normal operations). Nova-native
   minimal tech (CloudEvents 1.0 envelope, JSONL event log, SQLite cold
   store, hash-chained Decision Ledger via `outbox_writer.py` extension)
   + Infracost for pre-apply cost estimates. Hybrid model: existing