The terminal's forges screen cuts a spawned forge's link to its parent with `s` and a confirm, as MCP `sever` does #7259

For: the owner of a spawned forge who wants it to stand alone. Fork tree means the link is visible and cuttable from every door.

severForge (src/actions/follow.ts) is reached from the forge's page and MCP sever. The terminal's forges screen (src/tui/screens/forges.ts) only lists; it has no keys but esc.

Done:

• [ ] On the forges screen, a cursor moves over the forges with j/k.
• [ ] s, offered only to the owner of the selected forge's forge repository, asks to confirm in words that say nothing is deleted, then calls severForge; the row then shows no parent.
• [ ] A refusal shows the FAMILY_WORDS words.
• [ ] A new test/tui-forges.test.ts (or the existing one): sever after a confirm, esc changes nothing, someone else's forge offers no s.

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

Done on main already, waiting for you to close it: 083157a13e9a34d033ad08b01da0c6fa18ec3aad 586d419ca0fcd5f34e6967ef0dd3a3a757a55376

Closed: already done on main in 083157a, 586d419. Closed by the crew's live triage; reopen it to undo, and it stays open.