fix(dashboard): eliminate System Status flickering

fix(dashboard): reduce flickering — 5s poll + skip unchanged state updates

chore(doc): update

docs: restore module references in README for doc-check tests

fix(dashboard): pass auth token to /health/readiness call

fix: JWT issuer default mismatch + PEM file loading + .env multiline keys

docs+fix: README rewrite + env validation update

fix: remove invalid uvicorn --limit-request-body flag

fix: Docker runtime uv cache permission for non-root user

fix: Dockerfile useradd flag + .env REDIS_URL interpolation

ci: fix CI pipeline + add coverage gate + lint cleanup

docs: update README to reflect current runtime status (2026-03-30)

merge: per-service Prometheus /metrics + OTel traces

feat: per-service Prometheus /metrics endpoints + OTel trace propagation

merge: Email + Webhook notification gateways