docs(milestone): complete v1.23 — Nova Deck Cleanup & Python PPTX

13 requirements complete (REQ-263..275):
- P1: consolidate-docs — single -marp.md source of truth, speaker notes
  + talking points as HTML comments, delete plain .md (REQ-263,264)
- P2: restore-clean-style — theme:default + inline S&P style, retire
  nova-sp-theme.css from render (keep as reference), benefit .benefit
  class (REQ-265,266,267)
- P3a: inline-images — scripts/inline_images.py, self-contained HTML
  (REQ-268)
- P3b: python-pptx-generator — scripts/render_pptx.py structured
  editable S&P-themed PPTX, pyproject [slides] dep, dual PPTX
  (REQ-269,270)
- P4: trim-wordcount — ~20-30% trim on 8 verbose slides, remove
  'penetrate' repo-wide (G-001) (REQ-271,272)
- P5: ci-tests-readme + review + audit + ship — workflows install
  python-pptx, 43 tests pass, README rewritten (REQ-273,274,275)

Tags on v1.22.x line (v1.22.0 P0 -> v1.22.6 P5 final = milestone
release). Grill: PROCEED-WITH-REVISIONS (4 binding revisions G-001..G-004
applied: repo-wide penetrate purge, P3->P4 serialized, P3 split P3a+P3b,
P5+P6 merged). 43 slide/pptx tests pass. Merged to main.

---ci---
project: acdl
phase: 5
milestone: v1.23
status: complete
phase_role: final
requirements:
  covered: [REQ-263,REQ-264,REQ-265,REQ-266,REQ-267,REQ-268,REQ-269,REQ-270,REQ-271,REQ-272,REQ-273,REQ-274,REQ-275]
  partial: []
---/ci---

.ciagent/CHECKPOINT.json

@@ -1,15 +1,26 @@
 {
-  "phase": 0,
+  "phase": 5,
   "stage": "complete",
   "milestone": "v1.23",
-  "phase_role": "pre_execution",
+  "phase_role": "final",
   "attempts": 0,
-  "updated_at": "2026-08-11T23:50:00Z",
+  "updated_at": "2026-08-12T00:40:00Z",
   "project": "acdl",
-  "tag": "v1.22.0",
+  "milestone_complete": true,
+  "tag": "v1.22.6",
+  "requirements": ["REQ-263","REQ-264","REQ-265","REQ-266","REQ-267","REQ-268","REQ-269","REQ-270","REQ-271","REQ-272","REQ-273","REQ-274","REQ-275"],
   "release": {
     "forge": "gitea",
     "releases_created": true,
-    "release_ids": {"v1.22.0": 628}
-  }
+    "release_ids": {
+      "v1.22.0": 628,
+      "v1.22.1": 629,
+      "v1.22.2": 630,
+      "v1.22.3": 631,
+      "v1.22.4": 632,
+      "v1.22.5": 633
+    },
+    "milestone_release_id": "pending"
+  },
+  "notes": "v1.23 milestone complete. Tag v1.22.6 (milestone release). Merged to main. 13 requirements complete (REQ-263..275). 43 tests pass. Next milestone starts fresh."
 }