docs(agents): sync project guidance with current repo state

Update AGENTS.md to match current Makefile, source tree, and CI:

• Replace stale make target table with make help-driven list (adds py/pytest, py/start/stop/console, build, run, release) and drop obsolete "do NOT invoke build/run/console" warning.
• Drop uv sync from direct-dev snippet to resolve conflict with the existing "never run uv sync" gotcha; rely on make py/deps.
• Architecture: document composite_reporter.py, http_reporter.py, and healthcheck.py; note RemoteReporterConfiguration in models.
• Conventions: version source is pyproject.toml (no .bumpversion.cfg); CI now runs tests and builds/pushes the Docker image on main.