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/REQUIREMENTS.md

@@ -2015,16 +2015,16 @@ assert 20 main + 1 appendix.
 
 | REQ | Phase | Status |
 |-----|-------|--------|
-| REQ-263 | P1 | pending |
-| REQ-264 | P1 | pending |
-| REQ-265 | P2 | pending |
-| REQ-266 | P2 | pending |
-| REQ-267 | P2 | pending |
-| REQ-268 | P3a | pending |
-| REQ-269 | P3b | pending |
-| REQ-270 | P3b | pending |
-| REQ-271 | P4 | pending |
-| REQ-272 | P4 | pending |
-| REQ-273 | P5 | pending |
-| REQ-274 | P5 | pending |
-| REQ-275 | P5 | pending |
+| REQ-263 | P1 | complete |
+| REQ-264 | P1 | complete |
+| REQ-265 | P2 | complete |
+| REQ-266 | P2 | complete |
+| REQ-267 | P2 | complete |
+| REQ-268 | P3a | complete |
+| REQ-269 | P3b | complete |
+| REQ-270 | P3b | complete |
+| REQ-271 | P4 | complete |
+| REQ-272 | P4 | complete |
+| REQ-273 | P5 | complete |
+| REQ-274 | P5 | complete |
+| REQ-275 | P5 | complete |