feat: concurrent engine execution with graceful degradation

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- Run all local engines in parallel using goroutines + sync.WaitGroup
- Individual engine failures are captured as unresponsive_engines entries
  instead of aborting the entire search request
- Context cancellation is respected: cancelled engines report as unresponsive
- Upstream proxy failure is also gracefully handled (single unresponsive entry)
- Extract unresponsiveResponse() and emptyResponse() helpers for consistency
- Add comprehensive tests:
  - ConcurrentEngines: verifies parallelism (2x100ms engines complete in ~100ms)
  - GracefulDegradation: one engine fails, one succeeds, both represented
  - AllEnginesFail: no error returned, all engines in unresponsive_engines
  - ContextCancellation: engine respects context timeout, reports unresponsive

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Franz Kafka 2026-03-21 15:39:00 +00:00

parent 5181073a95

commit 385a7acab7

5 changed files with 355 additions and 35 deletions

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