docs(P57): polish PW & DX decks — new contract shape, S&P mermaid theme, Verification Coverage, Operating Model appendix

Contract examples updated to new shape:
- DX Slide 3 contract example: id/name/environment/infrastructure (no uses:, no module:)
- Version pins bumped from @v1.6/@v1.8 to @v1.10
- .acdl/contract.yaml → .acdl/contract.yml in all deck examples

Story beat prefix stripped:
- All 'Story beat: ' prefixes removed from narrative lines (DX source + both Marp decks)
- PW source-of-truth: added narrative lines to fix P51 drift (PW Marp had them, PW source didn't)

DX Slide 2 reconciliation:
- Title: 'Where ACDL Sits' → 'Where Agentic Cloud Delivery (ACDL) Sits' (spelled out)
- Source-of-truth inline mermaid reconciled to match .mmd/PNG (subgraphed LR version)
- Prose: added ACDL definition line

S&P mermaid theme (all 10 diagrams):
- assets/mmd/sp-theme.json: canonical S&P Red/Black/White theme
- Each .mmd file: %%{init:...}%% block with inline theme (self-contained)
- Two-tone classDef: accent (dark fill, white text, red border) for key nodes,
  supporting (white fill, black text, red border) for the rest
- All 10 PNGs re-rendered with --configFile sp-theme.json
- README build command updated with --configFile flag

GRILL G-005 (Verification Coverage):
- PW Slide 9: added block listing 6 deploy-unverified capabilities (CAP-017..022)
- DX A6: same block included in the new appendix slide

GRILL G-008 (Operating Model & Cost):
- Both decks: new A6 appendix slide (local emulators primary tier, zero cloud cost,
  live-AWS one-off spike per milestone, no BAU spend)

Cross-deck consistency:
- DX glossary: added missing IR row (PW had it, DX didn't)
- Both decks: 7-appendix convention (TOC updated, A1-A6)

HTML re-rendered:
- Both decks re-rendered from updated Marp source

---ci---
project: acdl
phase: 57
milestone: v1.10.2
status: execute
---/ci---

docs/presentations/README.md

@@ -155,6 +155,7 @@ docs/presentations/
 └── assets/
     ├── puppeteer-config.json                   ← no-sandbox config for mmdc
     ├── mmd/                                     ← mermaid source files (Step 2 input)
+    │   ├── sp-theme.json                         ← S&P Red/Black/White theme (mermaid-cli --configFile)
     │   ├── platform-works-01-contract-driven.mmd
     │   ├── platform-works-02-end-to-end-flow.mmd
     │   ├── platform-works-03-scope-boundary.mmd
@@ -256,12 +257,18 @@ for f in mmd/*.mmd; do
   PUPPETEER_EXECUTABLE_PATH=/root/.cache/ms-playwright/chromium-1217/chrome-linux64/chrome \
     npx --yes @mermaid-js/mermaid-cli@latest \
     -i "$f" -o "png/$name.png" \
-    -p puppeteer-config.json -s 2 -b transparent
+    -p puppeteer-config.json -s 2 -b transparent \
+    --configFile mmd/sp-theme.json
 done
 ```
 
 The `puppeteer-config.json` passes `--no-sandbox` to the headless browser
-(required when running as root in this environment).
+(required when running as root in this environment). The `--configFile
+mmd/sp-theme.json` applies the S&P Global Red/Black/White theme (dark
+`#1B1B1B` accent nodes with `#D6002A` red borders, white supporting nodes,
+`#F0F0F0` subgraph backgrounds). Each `.mmd` file also carries the same
+theme inline via a `%%{init:...}%%` block so it renders correctly even
+without the `--configFile` flag.
 
 ### Export a Marp deck to HTML (committed to repo)