feat: discover and display per-agent workspace skill roots

[0xNyk]

Summary

• Dynamically scan workspace-* directories under the openclaw state dir in both skill-sync.ts and skills/route.ts
• Display per-agent workspace skill roots in the Skills Hub with agent-specific labels
• Add getSourceLabel() function for dynamic source label resolution with violet badge styling for workspace-* sources

Closes #412. Supersedes #413.

Risk Level

Low — additive feature, no breaking changes. Falls back gracefully when no workspace-* directories exist.

Tests

• pnpm typecheck — passes
• pnpm test — 710/710 passing

Contribution Checklist

• Tests added/updated for behavior changes
• Lint/typecheck/build passing

Notes

The dynamic scanning uses readdirSync + existsSync which is consistent with the existing synchronous pattern in skill-sync.ts.

[github-actions]

📸 Screenshot Drift Check

This PR modifies UI source files. Please verify whether the README screenshots need refreshing:

• docs/mission-control-overview.png — main dashboard
• docs/mission-control-agents.png — agents panel
• docs/mission-control-memory-graph.png — memory graph

Changed UI files

src/app/api/skills/route.ts
src/components/panels/skills-panel.tsx

See docs/SCREENSHOT-GUIDE.md for instructions on capturing and optimising screenshots.

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