refactor(code): consolidate workspace commands under worker

[danii1]

Summary

• consolidate the unattended workflow under devintern worker: init, scaffold, add-repo, connect, run-now, and the daemon
• make worker connect workspace-only, with workspace.toml as the sole source of repository selection
• remove public --repo, repository auto-detection, and unused repository-local relay fallback/state routing
• connect all unverified GitHub repositories in the workspace, skip verified pairings, and continue after individual failures; tracker targets use the workspace environment
• remove the top-level devintern workspace namespace and update CLI help, docs, changelog, and regression coverage

Verification

• bun run format
• bun run lint
• bun run typecheck
• bun run test — 1305 passing in @getdevintern/code, all 11 package tasks green
• bun run build