refactor: Phase 4 - split worker package into focused files
Split 551-line worker/core.go into single-concern files:
- worker/config.go (+44 lines)
- Added config parsing: envInt(), parseCPUFromConfig(), parseGPUCountFromConfig()
- parseGPUSlotsPerGPUFromConfig()
- Now has all config logic in one place (440 lines total)
- worker/metrics.go (new file, 172 lines)
- Extracted setupMetricsExporter() with ~30 Prometheus metric registrations
- Isolated metrics logic for easy modification
- worker/factory.go (new file, 183 lines)
- Extracted NewWorker() factory function
- Moved prePullImages(), pullImage() from core.go
- Centralized worker instantiation
- worker/worker.go (renamed from core.go, ~100 lines)
- Now just defines Worker struct, MLServer, JupyterManager
- Clean, focused file without mixed concerns
Lines redistributed: ~350 lines moved from monolithic core.go
Build status: Compiles successfully
a5c1a9fc0b