Add read-only agent management panel

[huangruiteng]

Summary

• add a read-only Agent Management panel to the ops dashboard, derived from existing status/todo/history/quota projections
• group projected agent todos by claimed_by/agent_id and show status, claimed todo counts, last activity, next safe action, evidence refs, quota hints, and a copy-only status command
• add synthetic public todo_index data to the bundled status fixture plus a home-route smoke guard

Validation

• npm --prefix apps/dashboard run smoke:home-route
• npm --prefix apps/dashboard run smoke:home-browser
• npm --prefix apps/dashboard run build
• loopx check --scan-path apps/dashboard/src/views/dashboard-page.tsx --scan-path apps/dashboard/smoke/home-route-smoke.ts --scan-path examples/status.example.json (public boundary clean; existing loopx-meta history duplicate-index warning remains)
• loopx canary premerge --from-git-diff (passed; self_merge_allowed=true)

Notes

• This intentionally stays read-only: no reclaim, dispatch, priority mutation, workspace creation, or runtime task model is added.

[huangruiteng]

Self-merge validation summary:

Changed surfaces:

• apps/dashboard/src/views/dashboard-page.tsx: read-only Agent Management panel built from existing status/todo/history/quota projections.
• examples/status.example.json: public synthetic todo_index rows for dashboard visibility.
• apps/dashboard/smoke/home-route-smoke.ts: static guard for panel wiring and fixture projection.

Checks run:

• npm --prefix apps/dashboard run smoke:home-route
• npm --prefix apps/dashboard run smoke:home-browser
• npm --prefix apps/dashboard run build
• loopx check --scan-path apps/dashboard/src/views/dashboard-page.tsx --scan-path apps/dashboard/smoke/home-route-smoke.ts --scan-path examples/status.example.json: public boundary clean; existing loopx-meta duplicate-index warning only.
• loopx canary premerge --from-git-diff: passed, self_merge_allowed=true.
• GitHub Frontstage Pages build: passed; deploy skipped.

Manual holds: none. Coverage is enough because this PR is a read-only dashboard projection plus public fixture/smoke guard; it does not add dispatch/reclaim/write actions, runtime task state, benchmark behavior, permissions, or scheduler/quota semantics.