The city-card data hook still contained localStorage serialization and TTL eviction helpers alongside AI fallback and UI state transitions. Moving those helpers into scan-terminal-cache creates a reusable cache boundary for the scan terminal request layer without changing cache keys, TTLs, or payload shapes.
Constraint: Preserve existing localStorage keys and expiry behavior.
Rejected: Migrate all caches to RemoteData in this commit | cache-helper extraction is a safer intermediate step before query policy changes.
Confidence: high
Scope-risk: narrow
Reversibility: clean
Tested: npm run build
Not-tested: Browser private-mode quota edge cases beyond existing guarded behavior.
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