feat: add AI For Dummies presentation

GATES.md

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+# Gates: AI For Dummies standalone presentation
+
+OWNS: index.html, styles.css, app.js, docs/references/**, scripts/**
+
+Scope: Deliver a standalone presentation teaching skills, model routing, subagents, and worktrees.
+
+- [ ] G1: bundled research references and required lesson topics exist
+  CHECK: node scripts/verify.mjs
+  EXPECT: content verification passed
+  EVIDENCE: pending
+
+- [ ] G2: the standalone presentation has working phase interaction
+  CHECK: node scripts/verify.mjs
+  EXPECT: interaction verification passed
+  EVIDENCE: pending
+
+- [ ] G3: the document is valid and has no external runtime dependency
+  CHECK: node scripts/verify.mjs
+  EXPECT: standalone verification passed
+  EVIDENCE: pending
+
+- [ ] G4: responsive and accessibility presentation review
+  EVIDENCE: pending