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Patrick Buckley
8dd356b7e6
Address the Copilot review on #732 plus a task-agent sub-tool nesting race surfaced alongside it. Nesting (web UI): - A sub-tool step whose task_agent row hasn't painted yet (the 4-wide tool pool's ordering window) buffers and nests when the row lands, instead of escaping to a top-level row that looks main-harness-issued. - A row that never paints (id-correlation mismatch / aborted agent) escapes its buffered steps back to a visible top-level paint after a grace window, so steps are never buffered invisibly or leaked. - The nested card survives the parent row's pending->resolved rebuild; a call_id reused across turns builds a fresh card rather than stealing the prior agent's steps. - tool_info routes through the same nesting path (no duplicate top-level row); a namespaced sub-tool result no longer grafts onto an unrelated top-level row. Denial reasons (backend): - Preserve the specific denial reason a gate already stamped (operator feedback, or the matched policy pattern; web and CLI contracts) instead of clobbering it with a flat "Denied by user" -- in both the sub-agent and the main tool loop. Verified with the livepass task_agent harness (race + orphan-escape scenarios, headless) and unit tests.