Adds a metrics HTTP server to acb-worker exposing Prometheus text format
at /metrics, plus /health and /ready K8s probe endpoints. Tracks counters
(matches, errors, jobs, replays, polls, heartbeats) and histograms
(match duration, replay upload duration, replay size). Instruments the
full worker execution flow. Fixes .gitignore binary patterns to use
root-anchored paths so cmd/ subdirectories aren't incorrectly excluded.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
- Worker polls Cloudflare Worker API for pending match jobs
- Claims jobs and executes matches using the game engine
- Uploads replays to R2 via S3-compatible API
- Sends heartbeats during match execution
- Submits results back to Worker API
- Includes retry logic with exponential backoff
- API client tests for job coordination endpoints
Also fixes glicko2.ts: export g() and E() functions for testing
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
