Debounced requests can finish out of order, allowing an earlier response to replace newer results or repopulate a cleared field. Track a request generation and gate state updates, with deterministic regression coverage.
Constraint: Preserve the existing 300 ms debounce and admin usage API contract
Rejected: Add AbortController plumbing | sequence invalidation matches repository patterns without changing API signatures
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep async filter results gated against superseded queries
Tested: Focused Vitest (4 tests), vue-tsc, ESLint, and full frontend suite except two pre-existing rollback assertion failures
Not-tested: Live browser against production-sized user data
Related: https://github.com/Wei-Shaw/sub2api/issues/4551
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