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feat(observability): implement Prometheus metrics export and event-to-audit bridge #1308

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freemo wants to merge 1 commits from feature/observability-prometheus-audit into master
pull from: feature/observability-prometheus-audit
merge into: cleveragents:master
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freemo a6242c1e38 feat(observability): implement Prometheus metrics export and event-to-audit bridge
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Implements comprehensive observability infrastructure per issue #940:

- Add PrometheusRegistry with counters/histograms/gauges for all 14
  operational metric keys; supports /metrics HTTP endpoint (server mode)
  and file-based export (local mode)
- Add AuditBridge event subscriber that automatically writes
  security-relevant domain events to audit.jsonl with structured
  AuditRecord schema (timestamp, event_type, actor, action, resource,
  outcome, metadata, correlation_id, plan_id, session_id)
- Add configure_structlog() for JSON or text log output with
  inject_correlation_id processor for log correlation across plan
  executions
- Add observability config fields to Settings: metrics_prometheus_port,
  metrics_file_path, audit_jsonl_path, log_format
- Add prometheus-client>=0.20.0 to project dependencies
- Add 61 Behave BDD scenarios covering metrics registry, audit bridge
  routing, structured log output, and settings integration

ISSUES CLOSED: #940
 2026-04-02 10:14:36 +00:00