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# a11y Action Auto-Diff

Auto-diffs parent node state before/after mutating a11y actions. File-edit format output. 1s retry on no-change then error-exit. Broker detection.

user/developer
a11y diff action ux

## Steps

1. FEATURE: reads parent window node list befor...
2. FORMAT: < [role] removed-node and > [role] a...
3. NO-CHANGE: if diff empty wait 1s re-read re-...
4. BROKER: if [BLOCKER] appears in post not pre...
5. SKIP: non-mutating (read/wait/screenshot/ins...
6. IMPL: A11yActions.ActionDiff.cs partial clas...
7. SESSION-2026-05-21: skill registered, codex...