In the terminal, an admin marks several repositories and archives them in one keypress, and u undoes it #2523

On the terminal's home list of repositories, an admin can now mark several with space, archive them with a, and undo with u. The new tests, the type check and four related TUI suites pass. I did not run the full bun test; the forge runs the whole check on push.

• Marking: space toggles [x] on the repository under the cursor, only for a repository the viewer administers. The keys show in the key bar only where they apply.
• Archiving: a opens a confirm screen that names the marked repositories (for example "Archive 2 repositories?"). It previews with previewFleetIds, applies with applyFleetIds using the archive verb, and toasts "archived N — u undoes it". The marks are cleared afterwards.
• Undo: u calls undoFleetOp on that archive's receipt, as limbs.ts does, and the repositories return to the list. With no archive made from this screen, u still undoes the last On-you set as before.
• Non-admin: space and a do nothing and the bindings are hidden. applyFleetIds also refuses any repository the user doesn't administer.
• Code: the change is in src/tui/screens/dashboard.ts plus a README paragraph. There is no new action code and src/web is untouched.
• Tests: test/tui-archive-many.test.ts covers marking two, archiving, undoing to both awake, and a non-admin's space and a changing nothing.

Left out:

• The undo is held for the open screen only, so it is lost on restart. The receipt is still in the fleet log.
• Marks cover only the Repositories pane, not the filtered list of other people's repositories.
• Only the viewer's own repositories (and their orgs') can be archived this way.

To try it, SSH in as an admin, press space on two rows, a, then enter to confirm, then u.

Closes #2520

On the terminal's home list of repositories, an admin can now mark several with space, archive them with a, and undo with u. The new tests, the type check and four related TUI suites pass. I did not run the full bun test; the forge runs the whole check on push.

• Marking: space toggles [x] on the repository under the cursor, only for a repository the viewer administers. The keys show in the key bar only where they apply.
• Archiving: a opens a confirm screen that names the marked repositories (for example "Archive 2 repositories?"). It previews with previewFleetIds, applies with applyFleetIds using the archive verb, and toasts "archived N — u undoes it". The marks are cleared afterwards.
• Undo: u calls undoFleetOp on that archive's receipt, as limbs.ts does, and the repositories return to the list. With no archive made from this screen, u still undoes the last On-you set as before.
• Non-admin: space and a do nothing and the bindings are hidden. applyFleetIds also refuses any repository the user doesn't administer.
• Code: the change is in src/tui/screens/dashboard.ts plus a README paragraph. There is no new action code and src/web is untouched.
• Tests: test/tui-archive-many.test.ts covers marking two, archiving, undoing to both awake, and a non-admin's space and a changing nothing.

Left out:

• The undo is held for the open screen only, so it is lost on restart. The receipt is still in the fleet log.
• Marks cover only the Repositories pane, not the filtered list of other people's repositories.
• Only the viewer's own repositories (and their orgs') can be archived this way.

To try it, SSH in as an admin, press space on two rows, a, then enter to confirm, then u.

On the terminal's home list of repositories, an admin can now mark several with space, archive them with a, and undo with u. The check's one named failure ("clicking a help-bar hint presses the key it names") is fixed. My two new hints had pushed the "new repo" hint off the help bar, so the test could not find it to click. I moved the archive hints to the end of the bar and show a archive marked only once something is marked. tui-mouse.test.ts, tui-archive-many.test.ts and the type check pass locally; I didn't re-run the other seven shards.

The log's other line, shard 8 exiting 143 without naming a test, I did not touch. It looks like a timeout or kill rather than a failing test, so I'm treating it as unrelated to this change. If it recurs on the new push, it needs a separate look.

• Marking: space toggles [x] on the repository under the cursor, only for a repository the viewer administers.
• Archiving: a opens a confirm screen naming the marked repositories. Confirming runs the fleet archive verb through previewFleetIds and applyFleetIds. A toast then says "archived N — u undoes it".
• Undo: u calls undoFleetOp on that archive's receipt and the repositories return to the list. With no archive made from this screen, u still undoes the last On-you set as before.
• Non-admin: space and a do nothing for a non-admin, and the action refuses the repository regardless.
• Code and tests: the change is in src/tui/screens/dashboard.ts, with a README paragraph and test/tui-archive-many.test.ts. The tests cover mark two, archive, undo to both awake, and a non-admin's keys changing nothing. src/web is untouched.

Left out:

• The undo is held for the open screen only, so it is lost on restart. The receipt is still in the fleet log.
• Marks cover only the Repositories pane, not the filtered list of other people's repositories.
• Only the viewer's own repositories (and their orgs') can be archived this way.

To try it, SSH in as an admin, press space on two rows, a, then enter to confirm, then u.