[Maximooch]

Stacked on experimental child-session support (#142). Canonical asynchronous edit tools now expose native ACP before/after file diffs from snapshots the authorized EditService transaction already held. No adapter-side reads are added. Events are emitted only after successful commit, keep the tool-call ID, and survive the final tool-result update. Failed edits produce no success diff.

Limits are explicit: whole-file snapshots up to 128 KiB combined and 16 files per tool call; larger or deleted files receive an omission notice instead of a misleading partial snapshot. Other diff output remains text. The observer is request scoped and reaches the existing edit worker through copied context.

Validation: 64 aggregate ACP/edit-service tests pass, including actual ToolManager async dispatch and EditService commit/failure checks, full old/new bytes, new-file semantics and snapshot size caps. Scoped Ruff and diff checks pass. ACP CI includes the new suite.

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Project	Deployment	Actions	Updated
penguin	Ready	Preview	Oct 28, 2026 5:31am 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.