docs(init): validate specification — v1.23 milestone (REQ-263..275)

Established active_milestone: v1.23 (Nova Deck Cleanup & Python PPTX).
NFR milestone (docs/render/test only; no features). Tags on v1.22.x line
(v1.22.0 P0 -> v1.22.6 P6 final = milestone release). Branch:
milestone/v1.23-deck-cleanup-python-pptx.

Added REQ-263..275 to REQUIREMENTS.md covering:
- Consolidate docs: single -marp.md source of truth, delete plain .md,
  speaker notes/talking points as Marp HTML comments, keep
  talking-points.md as synced standalone aid (REQ-263,264)
- Restore clean style: theme:default + inline style block (S&P palette),
  retire nova-sp-theme.css from render (keep as reference), benefit
  callout restyle (REQ-265,266,267)
- Inline images: scripts/inline_images.py for self-contained
  redistributable HTML (REQ-268)
- Python PPTX generator: scripts/render_pptx.py structured editable
  S&P-themed PPTX via python-pptx, both PPTX outputs produced + attached
  (REQ-269,270)
- Trim word count: targeted ~20-30% trim on verbose slides, remove
  'penetrate' term (REQ-271,272)
- CI/tests/README: workflows install python-pptx, tests updated,
  README rewritten (REQ-273,274,275)

Driven by user feedback: deck looked 'out of whack'; wanted to return to
the clean style of the old the-developer-experience.html. Investigation
revealed the 'clean' reference was itself MARP output (default theme +
inline style); the standalone nova-sp-theme.css approach was fragile.

---ci---
project: acdl
phase: 0
milestone: v1.23
status: specify
---/ci---

.ciagent/REQUIREMENTS.md

@@ -1904,3 +1904,127 @@ assert 20 main + 1 appendix.
 | REQ-260 | P3 | complete |
 | REQ-261 | P4 | complete |
 | REQ-262 | P5 | complete |
+
+## v1.23 — Nova Deck Cleanup & Python PPTX
+
+> **NFR milestone** (docs/render/test only; no features). Tags run on the
+> **v1.22.x** line (milestone v1.23 → tags v1.22.0..v1.22.6). Final patch
+> `v1.22.6` = milestone release.
+>
+> Consolidates the deck to a single source-of-truth markdown document,
+> restores the clean S&P visual style (Marp `default` theme + inline
+> `style:` block, matching the old `the-developer-experience.html`),
+> embeds images as base64 in the HTML for redistribution, builds a
+> parallel structured python-pptx PPTX generator, and trims verbose
+> slides. `nova-sp-theme.css` is retained as a styling reference but
+> retired from the render path.
+
+### Category: Consolidate Docs
+- **REQ-263:** `nova-autonomous-cloud-delivery-marp.md` becomes the sole
+  source of truth. Speaker notes + talking points from the plain `.md`
+  are folded into the deck as Marp HTML comments (`<!-- Speaker notes:
+  ... -->`, `<!-- Talking points: ... -->`). The plain
+  `nova-autonomous-cloud-delivery.md` is deleted.
+- **REQ-264:** `nova-autonomous-cloud-delivery-talking-points.md` is kept
+  as a standalone presenter aid, synced from the deck's `<!-- Talking
+  points: -->` comments. Header note documents the mirror relationship.
+
+### Category: Restore Clean Style
+- **REQ-265:** Revert deck frontmatter `theme: nova-sp` → `theme:
+  default` and add an inline `style:` block porting the S&P visual
+  language (palette #D6002A/#1B1B1B, Akkurat Pro font, black title slide
+  with red top border, tables, blockquotes, code, aspect-ratio-aware
+  images). Keep current structure (H2 + bold-lead, no header, no badges).
+- **REQ-266:** `nova-sp-theme.css` is retained as a styling reference
+  (header comment documents its retired status). `render_slides.sh`
+  drops the `--theme "$THEME_CSS"` argument; the inline `style:` block in
+  frontmatter is the sole styling source at render time.
+- **REQ-267:** Benefit callouts on every slide are restyled: the
+  `**Benefit:**` prefix is removed; the callout becomes a styled
+  element (red top-rule + black italic text; white on title slides)
+  using a `.benefit` class in the inline style block.
+
+### Category: Inline Images
+- **REQ-268:** New `scripts/inline_images.py` (stdlib only: `base64`,
+  `re`, `mimetypes`) post-processes the rendered HTML: finds all
+  `<img src="assets/...">` relative paths, replaces each `src` with a
+  `data:image/<mime>;base64,...` URI. HTML becomes self-contained
+  (redistributable without the `assets/` folder). `render_slides.sh`
+  invokes it after the MARP HTML render, before staging.
+
+### Category: Python PPTX Generator
+- **REQ-269:** New `scripts/render_pptx.py` parses the consolidated
+  `*-marp.md` and produces a structured, editable, S&P-themed PPTX
+  (`nova-autonomous-cloud-delivery-python.pptx`) using `python-pptx`.
+  16:9 slides; title slide (black bg, red top bar, white H1); content
+  slides (red H2 title, bold lead, bullets, blockquote, embedded PNGs,
+  native PPTX tables, benefit callouts). HTML-comment speaker
+  notes/talking points are skipped. `python-pptx` added to
+  `pyproject.toml`. `render_slides.sh` invokes it as a new step.
+- **REQ-270:** Both PPTX outputs (MARP image-of-slide + python
+  structured) are produced by `render_slides.sh` and staged. CI
+  workflows install `python-pptx` and commit both. `attach_release_asset.py`
+  attaches both to the release.
+
+### Category: Trim Word Count
+- **REQ-271:** Targeted word-count trim on ~8 verbose slides (1, 5, 7,
+  8, 13, 14, 20, plus the appendix) — ~20-30% reduction on trimmed
+  slides. Tables and short slides are untouched. The spirit of each
+  slide is preserved.
+- **REQ-272:** The term "penetrate" (and derivatives) is removed from
+  all presentation files. Slide 5's "Nova never penetrates it" phrase is
+  removed with no replacement (slide 4 Anti-Goals already excludes the
+  PDLC from scope). `grep -ri penetrat docs/presentations/` returns
+  nothing.
+
+### Category: CI, Tests, README
+- **REQ-273:** CI workflows (`workflows-src/slides.yml` + synced
+  `.github`/`.gitea` copies) install `python-pptx`, run `render_slides.sh`
+  (which produces HTML + both PPTX + inlined images), and commit all
+  rendered artifacts. README documents the new pipeline.
+- **REQ-274:** `tests/test_slides_pipeline.py` is updated for the
+  consolidated doc (no plain `.md`), default theme + inline style
+  assertions (S&P visual properties, not theme filename),
+  `nova-sp-theme.css` retained-as-reference assertion, image-inlining
+  assertions (zero `src="assets/` references, ≥1 base64 per image),
+  python-pptx output existence, benefit callout class, "penetrate"
+  absence. New `tests/test_pptx_generator.py` asserts slide count, title
+  colors, table rendering, image embedding.
+- **REQ-275:** `docs/presentations/README.md` is rewritten to document
+  the single-document process (author `*-marp.md` → render HTML + both
+  PPTX → talking points mirrored), inline `style:` approach,
+  `nova-sp-theme.css` reference status, image inlining, and dual PPTX
+  output.
+
+### Out of Scope (v1.23)
+
+- **Deck narrative / 4-beat arc changes** — the Problem → Solution →
+  Proof → Roadmap + Ask structure is unchanged; only word count is
+  trimmed.
+- **Re-introduction of badges, version strings, or internal citations**
+  — v1.21 removed these; v1.23 does not re-add them.
+- **Removal of MARP** — MARP stays for HTML + PPTX; python-pptx runs in
+  parallel for comparison.
+- **Removal of orphaned `developer-experience-*` assets** — deferred to
+  a future cleanup phase (optional in v1.23 Phase 6 only if time
+  permits).
+- **Mermaid render scoping** — the mermaid render step continues to
+  render all `.mmd` files; scoping to referenced-only is deferred.
+
+### v1.23 Traceability
+
+| 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 | P3 | pending |
+| REQ-269 | P3 | pending |
+| REQ-270 | P3 | pending |
+| REQ-271 | P4 | pending |
+| REQ-272 | P4 | pending |
+| REQ-273 | P5 | pending |
+| REQ-274 | P5 | pending |
+| REQ-275 | P5 | pending |