[Maximooch]

Problem and change

Background shell commands can outlive their initiating model turn without showing further output in ACP. Subscribe to the real scoped process runtime events and emit separate execution cards with retained output tails, capture errors and terminal status. The UI never consumes model output cursors or polls for progress. On reload, a missing owned handle is reported as unknown rather than successful.

Stack dependency: stack/acp-progress-base combines draft #143 native diffs and #144 child approval cleanup, on #142 and the explicitly documented #133 runtime integration. No PRs have been merged.

Validation

• ACP aggregate: 57 passed, 1 skipped on Windows Python 3.11.
• Scoped Ruff and git diff checks passed.
• Dedicated Linux/Windows Python 3.11/3.12 CI includes the new suite.
• The actual subprocess producer test is temporarily skipped on Windows: it exposed os.set_blocking/pipe-capture failure in ProcessRuntime, being fixed in a separate reliability follow-up. This PR remains draft pending that dependency and the real Windows test.

Historical child-process cards replay, but child process reconnection is not reconstructed without a live observed child. These are standard ACP tool cards, not a claim of client-specific task panels or terminal RPC parity.

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Project	Deployment	Actions	Updated
penguin	Ready	Preview	Oct 28, 2026 5:37am UTC

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[Maximooch]

Integrated with preserved commit history through #161 (main commit abd8a66). Closing this stacked review after verifying its current head is an ancestor of main.