The terminal makes an organization you own from the palette, with the same rules and words as MCP `org_create` #7260

For: the owner setting up a client's forge from the terminal: the client's apps live under one organization, and today that first step needs a browser.

createOrg (src/actions/orgs.ts) is reached from the new-organization page and MCP org_create. No terminal command calls it.

Done:

• [ ] A palette command in src/tui/forge.ts, "New organization", for a signed-in person (never an agent), asks for a name in a small screen src/tui/screens/neworg.ts and calls createOrg.
• [ ] A taken, reserved or invalid name is refused with the same words as MCP org_create, and nothing is made; the name stays in the field to fix.
• [ ] On success the screen says the organization's name and where it lives, and the new-repository screen offers it as an owner.
• [ ] A new test/tui-neworg.test.ts: make one, refuse a taken and a reserved name, an agent session has no such command.

Files: src/tui/screens/neworg.ts, src/tui/forge.ts, one test. Risk: low; reuse the action.