* feat: acknowledge Compose Doctor preflight findings per stack
Add node-scoped preflight acknowledgements with read-time filtering.
Supports four expiry modes and activeStatus for banner, tab dot, and readiness.
* fix: align preflight acknowledge UI with design system
Use Combobox, modal chrome, mono fields, and non-destructive clear confirm.
* fix: update test mocks to match new preflight field names
The preflight-acknowledgements feature renamed status-\>activeStatus and
highestSeverity-\>activeHighestSeverity in the preflight report shape. The
corresponding test mocks in three files still used the old field names,
causing 6 test failures across backend and frontend.
- backend: update-guard-service mock now passes activeStatus
- frontend PreflightPanel: Report interface and report() helper now include
activeStatus, activeHighestSeverity, activeCount, acknowledgedCount
- frontend StackAnatomyPanel doctor: mock API response now includes
activeHighestSeverity and activeStatus
Anso
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