nbari / pg_exporter / 28264137056

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0.13.0 - add blocking/CPU-saturation diagnostics and DevPod workspace

Diagnostics (v0.13.0):
- locks: pg_blocked_sessions, pg_blocking_sessions,
  pg_longest_blocked_seconds, pg_lock_waits{mode}
- activity: pg_stat_activity_on_cpu_backends (active + wait_event IS NULL)
- Grafana: Locks & Blocking panels, missing-index signals (Table
  Statistics), new CPU Pressure row
- docs/diagnosing-database-pressure.md; README + CHANGELOG [0.13.0]

DevPod / Dev Containers workspace:
- compose (app + postgres:18), mise, chezmoi dotfiles, scripts/dev-up
- on-demand Prometheus+Grafana (observability profile) scraping app:9432
  over the compose network; Grafana hot-reloads dashboard.json; just
  metrics-dev / scripts/metrics-dev
- CI: harden cargo network retries; fix cargo clean (target subdir)

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