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GET /api/v1/health re-ran all 14 health checks on every request, 4 of which shell out to ffmpeg/ffprobe via CliWrap — so each poll spawned ~4 subprocesses. The existing HealthCheckSummary cache was write-only. Cache the full result list for 30s inside HealthCheckService keyed on a new "healthcheck.results" entry; a non-forced call returns it on a hit, skipping the checks and the (subscriber-less) summary publish. Add a `bool forceRefresh` first parameter to IHealthCheckService.PerformHealthChecks: the API poll path reads the cache, while startup (RunHealthChecksService) and the troubleshooting support bundle force a fresh run. Refresh surface: GET /api/v1/health gains an optional `[FromQuery] bool refresh` (additive, follows the ?deep= exemplar); the SPA "Refresh health" button calls /api/v1/health?refresh=true, the initial/poll load does not. Tests: HealthCheckService cache-hit vs force-bypass (mutually opposing, non-vacuous), handler+controller refresh-flag threading, SPA refresh URL. Docs: decisions.md 2026-07-19 (#431), api-conventions §2; regenerated v1.json. fixes #431 Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>