feat(P1): restore S&P Global Energy theme + PPTX automation (REQ-214, REQ-228)

REQ-214: Restore the S&P Global Energy Marp style: block (from commit
ae0cb58 / v1.9.2 P45) to the unified deck. Colors: H1/H2 #D6002A (red-core),
title-slide bg #1B1B1B (grey-90) + 8px #D6002A top accent, body #1B1B1B,
blockquote border #D6002A, table headers #F0F0F0, font 'Akkurat Pro' with
web-safe fallbacks. Nova header/footer text preserved (rebrand not touched).
HTML re-rendered (229 S&P color refs confirmed).

REQ-228: scripts/render_deck.sh (HTML + PPTX render + git add) +
scripts/attach_release_asset.py (Gitea release asset upload via API). PPTX
is now a first-class committed binary (D-141, no LFS). README updated:
'PPTX not committed' → 'PPTX committed + attached'. PPTX committed (3.6 MiB,
19 slides).

---ci---
project: acdl
phase: 1
milestone: v1.18
status: execute
requirements:
  covered: [REQ-214, REQ-228]
  partial: []
---/ci---

docs/presentations/README.md

@@ -100,9 +100,11 @@ CHROME_PATH=/root/.cache/ms-playwright/chromium-1217/chrome-linux64/chrome \
 ```
 
 The `--allow-local-files` flag is **required** for PPTX export so the local
-PNG diagrams are embedded in the file. PPTX files are not committed to the
-repo (binary, no meaningful diffs) — they are uploaded to the Gitea release
-as downloadable attachments.
+PNG diagrams are embedded in the file. As of v1.18 (REQ-228, D-141), PPTX
+files **are committed to the repo** as first-class binary artifacts (no LFS)
+and are also attached to the phase's Gitea release via
+`scripts/attach_release_asset.py`. The render + commit + attach pipeline is
+automated by `scripts/render_deck.sh`.
 
 ### Step 4 — Talking points (presenter cues)
 

docs/presentations/nova-no-humans-platform-marp.md

@@ -6,13 +6,25 @@ size: 16x9
 header: 'Nova — The No-Humans Infrastructure Platform'
 footer: 'Act %{page}/5 — v1.17'
 style: |
-  section { font-size: 0.85em; }
-  h1 { color: #1a1a2e; }
-  h2 { color: #16213e; }
-  table { font-size: 0.75em; }
-  .badge { padding: 2px 8px; border-radius: 3px; font-size: 0.8em; }
-  .badge.planned { background: #fff3cd; color: #856404; }
-  section.title { background: #1a1a2e; color: white; }
+  section {
+    font-family: "Akkurat Pro", "Helvetica Neue", "Arial", sans-serif;
+    font-size: 22px;
+    color: #1B1B1B;
+  }
+  h1 { color: #D6002A; font-size: 34px; margin-bottom: 0.3em; }
+  h2 { color: #D6002A; font-size: 26px; margin-bottom: 0.2em; }
+  section.title { background: #1B1B1B; color: #fff; border-top: 8px solid #D6002A; }
+  section.title h1 { color: #fff; }
+  table { font-size: 18px; width: 100%; }
+  th { background: #F0F0F0; }
+  blockquote { border-left: 4px solid #D6002A; color: #2E2E2E; font-size: 20px; }
+  img { display: block; margin: 0 auto; max-height: 320px; }
+  .badge {
+    display: inline-block; padding: 2px 8px; border-radius: 4px;
+    font-size: 14px; font-weight: 600;
+  }
+  .badge.today { background: #c6f6d5; color: #22543d; }
+  .badge.planned { background: #fef3c7; color: #78350f; }
 ---
 
 <!-- _class: title -->