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Agents finish a task and just stop (never calling `close`), so daemons used to run forever, leaving their per-session scratch tabs + tab group in the user's Chrome. Two cases now handled: - Default idle timeout (10 min; AGENT_BROWSER_IDLE_TIMEOUT_MS overrides, 0 disables). On idle the daemon close()s the tabs IT created → the empty tab group is auto-removed by Chrome. Timer resets on every command, so active sessions are untouched. Adopted user tabs are never owned, so never closed. - `keep` — leave the ACTIVE tab for the user: unown it (exempt from close/idle) + ask the extension to ungroup it (ABExt.ungroupTab → 0.4.12) so it becomes a normal tab. Scratch gets cleaned, deliverable tabs stay. Also fix two clippy violations in the concurrently-landed #47 viewport code (manual char comparison + iter().any→contains) that were failing main's CI. ext 0.4.12: handle ABExt.ungroupTab (chrome.tabs.ungroup). 870 tests pass.