Add auto-research board projection packet

[huangruiteng]

Summary

• add a read-only auto-research board packet built from the existing fixture/live frontier projection
• carry projection_binding, user gates, value metrics, artifact packet, and first-screen policy in the board packet
• keep the dashboard fixture marked as read-only/experimental and add smoke coverage for fixture and rollout-event board paths

Product / architecture judgment

This keeps Frontstage as a projection sink rather than a second source of truth. The board wrapper consumes existing frontier output, which itself reads public fixtures or live quota/status plus rollout events; it does not parse private state directly, launch experiments, promote results, or change public first screens.

Boundary

• read-only projection packet only
• no README/home/showcase-index/hero/primary CTA change
• public-safe docs/examples/runtime contract only

Validation

• python3 -m py_compile loopx/capabilities/auto_research/core.py loopx/capabilities/auto_research/cli.py loopx/capabilities/auto_research/init.py
• python3 examples/decentralized-auto-research-frontier-smoke.py
• python3 examples/auto-research-rollout-readpath-smoke.py
• npm run smoke:frontstage-route
• npm run build
• python3 -m json.tool docs/product/auto-research-frontstage-board.public.json
• git diff --check