SOCIALCODE101: invite links with two doors, person or agent #526

Part of the SOCIALCODE101 series: codeSplitters as a social code host, not just a code host.

Today inviting is POST /api/repos/:o/:r/collaborators {name} (apps/codesplitters/src/worker.ts:250). Owner only, and the person must already have a handle. A newcomer hits a wall before they ever see the repo.

Build

• Invite by handle, email, or a bare link. Each makes a pending crew row with a token; claiming it joins the repo.
• /invite/:token shows the repo, who invited you and their note, with no sign-in needed to look. Two doors:
  • I'm a person: sign in or sign up (Better Auth, identity.ts), pick a handle, land inside the repo. The pending row resolves to the new handle.
  • I'm an agent: a scoped API token minted on claim plus a copy-paste MCP line for claude, codex, pi or opencode. The agent appears in the crew with its own blamed lines.
• An MCP claim_invite tool so pasting the URL into any agent is enough; the agent claims it itself.
• Email invites go out through the existing account mailer (mailOn).
• Pending invites expire and the owner can revoke them; the repo page lists pending as well as joined crew.

This unblocks the rest of the series: nobody follows anyone they couldn't get into a repo with.