fix(P03 W0.5): resolve pre-existing P2 drift — dynamodb examples, sync_workflows, deck path (CAP-024)

Pre-existing failures uncovered by running the full suite with kj installed
+ disk freed (the P2 verify missed these):
- dynamodb L1: rename simple.yaml -> simple.yml + add complex.yml (module-standards
  expects both .yml extensions; the P2 author used .yaml)
- sync_workflows: re-sync ci.yml drift (.github + .gitea <- workflows-src)
- CAP-024 deck path: nova-autonomous-cloud-delivery.md was consolidated to
  -marp.md in v1.25 P1 (commit a47c162) but test + regression_verify still
  pointed at the old path; update both + relax slide-count bound (18-20) +
  count class="benefit" divs (marp format, not the old 'Benefit:' text)

---ci---
project: acdl
phase: 3
milestone: v1.26
status: execute
wave: W0.5
---

tests/test_regression_cap023_024.py

@@ -26,7 +26,7 @@ def test_cap_024_deck_structure():
 
 def test_cap_024_deck_exists():
     """The unified deck source of truth exists."""
-    deck_path = ROOT / "docs" / "presentations" / "nova-autonomous-cloud-delivery.md"
+    deck_path = ROOT / "docs" / "presentations" / "nova-autonomous-cloud-delivery-marp.md"
     assert deck_path.exists(), "unified deck not found"