docs(milestone): complete v1.22 — Nova Deck Layout Fix

9 requirements complete (REQ-254..262):
- P1: theme-css — section padding + overflow + image rules + title
  chrome + spacing tightening (REQ-254,255,256)
- P2: render-scripts — delete render_deck.sh, pin CLI versions, 2x
  scale + transparent bg (REQ-257,258)
- P3: mermaid-relayout — telemetry TB + platform-pipeline 4-node TB,
  re-rendered 2x transparent (REQ-259,260)
- P4: deck-content — split slides 3+8 (18->20 main), trim 8
  overflowing slides, remove redundant header (REQ-261)
- P5: render-and-test — re-render HTML+PPTX, add 9 layout/aspect-
  ratio/theme-structural tests (REQ-262)
- P6: final review + audit + ship (this commit)

Final review fixes: source .md + talking-points re-synced to 20-slide
structure; ![h:480 class:tall] directives applied; README stale
references updated; CSS trailing newline added.

Root cause: nova-sp-theme.css had zero section padding (declared
/* @theme nova-sp */ as a comment, not the @theme directive; did not
@import Marp default theme). Combined with overflow:hidden, blunt
img max-height:320px, header+footer chrome on every slide, and two
P5 diagrams with extreme aspect ratios (13.52x and 0.63x), 8 of 19
slides overflowed. NOT a P5 regression — theme CSS byte-identical
P3->P5; P5 denser content made pre-existing flaws visible.

Tags on v1.21.x line (v1.21.0 P0 -> v1.21.6 P6 final = milestone
release). 32 slide tests pass (23 original + 9 new). 94 key-file
tests pass. Pipeline check exit 0.

---ci---
project: acdl
phase: 6
milestone: v1.22
status: complete
phase_role: final
requirements:
  covered: [REQ-254,REQ-255,REQ-256,REQ-257,REQ-258,REQ-259,REQ-260,REQ-261,REQ-262]
  partial: []
---/ci---

docs/presentations/nova-autonomous-cloud-delivery-marp.md

@@ -106,7 +106,7 @@ Every hour a developer spends writing, deploying, fixing, or remediating infrast
 
 **How intent becomes verified infrastructure — fail-fast policy scanning before the plan, runtime scanning after it.**
 
-![h:480](assets/png/platform-pipeline.png)
+![h:480 class:tall](assets/png/platform-pipeline.png)
 
 - **Contract → resolver → adapter → Checkov on static code (before plan) → terraform plan → Wiz on the plan → confidence signal → stage gate → apply → evidence + ledger**
 - **Fail-fast, quick feedback** — Checkov runs on the authored Terraform code before `terraform plan` so developers get immediate policy feedback
@@ -166,7 +166,7 @@ Separation-of-duties on prod: the approver cannot be the same person who built t
 
 **Every metric in this deck is traceable to a real emitted signal — the live-ops dashboard makes operations visible in PowerBI.**
 
-![h:480](assets/png/telemetry-live-ops.png)
+![h:480 class:tall](assets/png/telemetry-live-ops.png)
 
 - **Platform components → CloudEvents envelope → event log + decision ledger + run records → collector → cold store → PowerBI views → live ops dashboard**
 - **The live ops dashboard (PowerBI)** surfaces the four CTO-grade metrics (Lead Time, Vulnerability Count, MTTR, Cloud Spend) alongside trust metrics (Decision Ledger coverage, Attestation coverage) and efficiency metrics (touchless resolution, escalation frequency)