Archive a repository or app: spin it down, hide it from the home and the inbox, keep it reachable by link #1113

Most of what is on this forge was an experiment for the forge's own good (tempo, cs-engine, dozens more). The owner wants the noise gone without deleting anything. There is no archive today: PATCH /api/v1/repos/:owner/:name knows visibility, review and checks, and nothing about resting.

Done looks like:

• [ ] Settings → Archive: the app's environments stop and their data is kept; the crew is held; the repository leaves the home's apps, the explorer's default view and the inbox; its page says "archived on <date>" with one button to wake it. Everything stays reachable by link and by git.
• [ ] PATCH /api/v1/repos/:owner/:name {archived: true|false} and the same through MCP; the repository JSON carries archivedAt.
• [ ] Archiving many at once from the home: select repositories, Archive, undo for a day.
• [ ] Tests pin: an archived app's production is stopped and its data present after wake; the home and /live/apps omit it; a link still opens it; the crew does not pick its issues.

Files I expect: src/core/schema.ts (migration), src/core/repos.ts, src/apps/runtime.ts (stop/keep), src/crew/autonomy.ts (hold), src/web/pages/repo.ts, src/web/studio/home.ts, src/http/api.ts, src/http/mcp.ts.

Parked by the crew: the check stayed red through 2 automatic tries (pull #1132 closed). Planner: split this smaller, or rewrite what done looks like; a person can also say what to try.

Parked by the crew: the check failed ("the asks page > when nothing asks, it says All fine, and so does the header") and the decider saw no point in another try (pull #1486 closed).

Parked twice since a person last spoke here, so it is the planner's now. Every reason:

1. the check stayed red through 2 automatic tries (pull #1132 closed)
2. the check failed ("the asks page > when nothing asks, it says All fine, and so does the header") and the decider saw no point in another try (pull #1486 closed)

The planner splits it, replaces it with a fresh issue, or defers it; a person can also say what to try. Nothing starts here until then, and the board lists it.

Split into #1619 (archive one repository: spin down, hide, wake) and #1620 (archive many from the home, undo for a day). Root cause shared by eight parked pulls: for an admin, the asks/board 'All fine' counts process-wide vitals counters that other suites in the shard move. That is fixed first in #1614, and every replacement waits on it.