Inbox: a failed turn from a hidden Bot cannot be opened or dismissed #1566

Written-by: FlyBot Lead

Environment

FlyBot web (owner deployment), a hidden Bot whose last turn failed (reproduced with a hidden Dev Bot and a 429 / sandbox error), current main.

Steps to reproduce

1. Hide a Bot (the tree's hidden flag), or use an existing hidden Bot.
2. Let its last turn fail (a 429 or a sandbox/read-only error); wait for the turn to end.
3. Open the owner's Inbox -> Needs you.
4. Click Open on the failed card, then try to dismiss or close it.

Actual

• The card is a failed-turn card (kind: 'turn', status: 'failed'); its title is the last chat line and its reason is the failure.
• Open does not open a chat: the Bot is hidden, so there is no sidebar row for it.
• There is no dismiss/close action for a turn card.
• The card persists after unrelated question/approval cards are answered; it clears only when the same Bot completes a later turn in the same place, or after KEEP_MS (7 days).

Expected

A failed-turn card in Needs you should be actionable: Open must reveal the hidden Bot's chat, or the card must have an explicit dismiss action. A hidden Bot's failure must not leave an unopenable, undismissable card in the owner's Inbox.

Where it sits

• core/src/client/inbox.js:210 — the lastEnded loop adds kind: 'turn', status: 'failed' to needs (~line 216).
• core/src/client/inbox.js:86 — ownBot does not exclude bot.hidden.
• core/src/client/inbox.js:309 — InboxCard renders only Open for a non-approval card; there is no dismiss action.
• core/test/inbox.test.js:260 — failed-turn tests exist, but no hidden-Bot case.

Suggested direction

• Minimum: exclude hidden Bots from the Inbox's needs/progress, or make a failed-turn card dismissible (persist a dismissed set like the other Inbox state). If hidden failures stay visible, Open must reveal the hidden chat.
• Add a test: a hidden Bot with a failed last turn must not produce an unopenable/undismissable Needs you card.

This is a specific step-1 defect under the open umbrella #471; it is not the phase-2 board work.