3.1.0: mx mission-control — live web dashboard

[rousan]

Adds mx mission-control (alias mx mc): a local, read-only live web dashboard for the runtime. Run it, open the printed http://localhost:7777 (a second monitor works well), and watch a calm, monochrome, auto-refreshing overview of every repo's and work's health plus a consolidated ports board.

Minor — runtime stays v3, no migration.

Server (zero runtime deps)

A hand-written node:http server serves a single self-contained HTML page (/), a JSON snapshot (/api/state), and a Server-Sent Events stream (/api/stream). It recomputes on a short timer and pushes instantly on manifest changes (fs.watch on works/, repos/, mx.json). --port walks upward if busy (default 7777); -o opens the browser. State is built in-process from listRepoHealth + listWorkHealth — it never mutates the runtime.

UI — apps/mission-control/ (React + Vite + Tailwind)

• Builds to one inlined index.html (vite-plugin-singlefile), copied into npm/mission-control/ at build time. React/Vite/Tailwind are dev-only, so the published @roulabs/mx keeps zero runtime dependencies. pnpm build builds the dashboard before the CLI so the copy step finds dist/.
• Theme auto-syncs with the OS via prefers-color-scheme (light + dark).
• Semantic health colors on the monochrome canvas: green ✓ when healthy, red ⚠ when not.
• Works grid shows active works by default with a "show archived" toggle.
• Ports board is independent (always every work) and rendered as a nested tree — work → worktree → (service · port · url) so names aren't repeated; cross-work collisions flagged in red, archived works dimmed.

Also in this release

• Fix a false positive in repo-health rendering (CLI + dashboard): a repo with no remote (no origin/HEAD) has no default branch to compare against, so its current branch is no longer flagged — only a detached HEAD is. Now matches @mx/core (which already treated it as healthy).
• Cleaned two stale references to the removed mx work worktree hydrate command / --no-hydrate flag in the stamped templates/.

Code

• CLI: commands/missionControl.ts, paths.ts#missionControlHtml(), --port flag, main.ts routing (mission-control / mc), help text.
• New apps/mission-control/ workspace; tsup copies its dist/ into npm/mission-control/; root build builds it first; eslint ignores it; .gitignore covers npm/mission-control/ and .playwright-mcp/.
• Bump npm/package.json → 3.1.0.

Verification

typecheck (all 3 projects) / lint / 85 tests / build all green. Smoke-tested end-to-end against a seeded multi-repo, multi-worktree runtime: /, /api/state, SSE /api/stream; browser screenshots confirm the UI in light and dark, the archived toggle, the semantic colors, the no-remote fix, and the nested ports tree (incl. a worktree with multiple ports).