feat(hands-on): add guardrails rules lab and wire into docs

- New hands-on/rules/ interactive page: five toggleable rule sources
  (AGENTS.md, gate-discipline skill, Husky pre-commit, check-ui-contract
  enforcer, commitlint) rebuild a ruled prompt live against a naive prompt.
- Visual system mirrors hands-on/starter (same palette, vanilla JS).
- index.html hands-on section now links both labs.
- docs/operations-guide.md gains a 'Hands-on rules lab' subsection.
- README project structure lists the new lab.
- verify.mjs passes content, interaction, and standalone checks for both labs.

responsive.css

@@ -65,7 +65,7 @@ button{font-family:inherit}
 .install-skills{display:grid;grid-template-rows:auto 1fr auto;margin-top:24px;color:var(--paper);background:var(--deep);border-left:7px solid var(--gold)}.install-skills header{display:flex;justify-content:space-between;align-items:center;gap:24px;padding:20px 24px;border-bottom:1px solid #ffffff2d}.install-skills header>div{display:grid;gap:7px}.install-skills header span,.install-skills footer{color:var(--gold);font:500 8px 'DM Mono',monospace;letter-spacing:.08em}.install-skills header strong{font-size:15px}.install-skills button{display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #ffffff50;color:var(--paper);background:transparent;cursor:pointer}.install-skills button:hover,.install-skills button.copied{color:var(--ink);border-color:var(--gold);background:var(--gold)}.install-skills button i{font-style:normal}.install-skills pre{max-height:360px;margin:0;padding:24px;overflow:auto;white-space:pre-wrap;background:#0b1b27}.install-skills pre code{font:10px/1.7 'DM Mono',monospace}.install-skills footer{padding:16px 24px;color:#b9c8d1;border-top:1px solid #ffffff2d}.install-skills button:focus-visible{outline:3px solid var(--gold);outline-offset:3px}
 
 /* Copy-ready hands-on lab */
-.hands-on{margin-bottom:130px;padding-top:80px;border-top:1px solid var(--line)}.hands-intro{display:grid;grid-template-columns:.9fr 1.1fr;gap:70px;align-items:end;margin:45px 0}.hands-intro h2{margin-bottom:0}.hands-intro>div:last-child>p{max-width:650px;margin:0;color:var(--muted);font-size:14px;line-height:1.75}.starter-link{display:inline-block;margin-top:18px;color:var(--blue);font:700 11px 'DM Mono',monospace;text-decoration:none;border-bottom:2px solid var(--gold)}
+.hands-on{margin-bottom:130px;padding-top:80px;border-top:1px solid var(--line)}.hands-intro{display:grid;grid-template-columns:.9fr 1.1fr;gap:70px;align-items:end;margin:45px 0}.hands-intro h2{margin-bottom:0}.hands-intro>div:last-child>p{max-width:650px;margin:0;color:var(--muted);font-size:14px;line-height:1.75}.starter-link{display:inline-block;margin-top:18px;color:var(--blue);font:700 11px 'DM Mono',monospace;text-decoration:none;border-bottom:2px solid var(--gold)}.starter-links{display:flex;flex-wrap:wrap;gap:6px 24px;margin-top:18px}.starter-links .starter-link{margin-top:0}
 .exercise-brief{display:grid;grid-template-columns:190px 1fr;gap:22px;padding:26px 30px;color:var(--paper);background:var(--deep)}.exercise-brief>span{color:var(--gold);font:500 9px 'DM Mono',monospace;letter-spacing:.09em}.exercise-brief>strong{font-size:clamp(20px,2.6vw,34px);line-height:1.12}.exercise-brief>div{grid-column:2;color:#afbec7;font:500 9px 'DM Mono',monospace;letter-spacing:.05em}.exercise-brief b{margin-left:18px;color:var(--accent)}.exercise-brief b:first-child{margin-left:0}
 .prompt-compare{display:grid;grid-template-columns:1fr 1fr;gap:1px;margin-top:1px;background:var(--line)}.prompt-card{display:grid;grid-template-rows:auto 1fr auto;min-width:0;min-height:600px;color:var(--paper);background:#19364a}.prompt-card.enhanced{background:#596f9a}.prompt-card header{display:flex;justify-content:space-between;align-items:center;padding:20px 22px;border-bottom:1px solid #ffffff32}.prompt-card header>div{display:grid;gap:6px}.prompt-card header span,.prompt-card footer{font:500 8px 'DM Mono',monospace;letter-spacing:.09em}.prompt-card header>div span{color:var(--gold)}.prompt-card header strong{font-size:17px}.prompt-card button{display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid #ffffff50;color:var(--paper);background:transparent;cursor:pointer}.prompt-card button:hover,.prompt-card button.copied{color:var(--ink);border-color:var(--gold);background:var(--gold)}.prompt-card button i{font-style:normal}.prompt-card pre{margin:0;padding:25px;overflow:auto;white-space:pre-wrap}.prompt-card pre code{font:11px/1.72 'DM Mono',monospace}.prompt-card footer{padding:17px 22px;color:#bfccd4;border-top:1px solid #ffffff32}.prompt-card.enhanced footer{color:#e5e3ef}.prompt-card button:focus-visible,.starter-link:focus-visible{outline:3px solid var(--gold);outline-offset:3px}
 .comparison-strip{display:grid;grid-template-columns:190px repeat(4,1fr);gap:1px;background:var(--line)}.comparison-strip>*{padding:18px;background:var(--paper)}.comparison-strip>span{color:var(--accent);font:700 9px 'DM Mono',monospace;letter-spacing:.08em}.comparison-strip>div{color:var(--muted);font:500 10px 'DM Mono',monospace}.comparison-strip b{margin-right:8px;color:var(--blue)}.copy-status{min-height:20px;margin:15px 0 0;color:var(--blue);font:600 10px 'DM Mono',monospace;text-align:right}