docs(agent): refactor for discoverability + fix post-split stale paths

fix(agent): add missing 'patterns' hosted tool contract + fix search text color

fix(scripts): point package_smoke at /health.json + drop service-name check

fix(sec-edgar): rule-based <table> rebuild + 10-K heading-split healing + 113 real-world fixtures

feat(agent): single-source-of-truth registry + 14 new /agent/api/* routes + multi-host installer

Initial open-source release