Replace net/http handlers with Fuego framework for automatic OpenAPI 3.0
spec generation. Add generated Go client package, OpenAPI extraction
script, and update Makefile with separate build/run targets for both
binaries.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add a new receiver application under cmd/receiver that accepts metrics
via HTTP POST and stores them in SQLite using GORM. The receiver expects
GitHub Actions style execution context (org, repo, workflow, job, run_id).
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
