Add live AI agent workflow discovery demo

[enricopiovesan]

Summary

• New /discover.html page: fetches the real, live Traverse capability registry (registry.traverse-framework.com/catalog.json) client-side and composes a workflow from whatever's actually published right now — no fixtures, no precomputed data.
• Graph rendered with AntV G6: Goal → Traverse system (AI Agent / MCP / Runtime, grouped in one combo) → capability chain → Result, with dashed (discovery) vs. solid (data flow) edges and a live idle → running → completed execution-state simulation, matching the three-state pattern from the UMA chapter-13 reference app.
• Capability names are humanized in the UI (e.g. "Normalize Phone Number") while the real dotted contract id stays visible as a caption for verification, and each capability node links out to its real contract page on the registry.
• Linked from the Registry and Agents pages.
• Fixed .claude/launch.json, which was pointing at serve dist/ (stale build output) instead of the actual Astro dev server.

Test plan

• npm run build passes clean, page included in generated sitemap
• Verified live fetch against the real registry catalog in-browser (dark + light theme)
• Verified full reveal → execution-simulation cycle across multiple runs (no overlapping nodes, no missing edges, graph instance reused correctly across re-runs)
• Verified capability node click-through to real registry contract pages
• Verified responsive layout (mobile width) and theme-toggle reactivity

🤖 Generated with Claude Code