Add Repo Watch snapshot backend and web surface

[arach]

Summary

• add the SCO-061 Repo Watch backend contract and runtime snapshot scanner
• expose /v1/repo-watch/snapshot through the broker and /api/repo-watch through the web server
• add the Repos web surface, design studio study, and lightweight appearance settings controls

Verification

• bun test packages/runtime/src/repo-watch.test.ts
• npm --prefix packages/runtime run check
• npm --prefix packages/web run build
• live broker smoke: /v1/repo-watch/snapshot returned 8 projects / 12 worktrees in ~2.23s

Known Follow-Up

• npm --prefix design/studio run build currently fails on an existing unrelated type error in app/studies/assistant/page.tsx comparing msg.who to "operator" when its type is "scout" | "you".

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Project	Deployment	Actions	Updated (UTC)
openscout	Ready	Preview, Comment	Jun 3, 2026 4:04pm