stave metrics

Produce a stable Prometheus text format metrics file covering
posture score, findings by severity, SLA burn rates, chain
activations, and per-team metrics.

Designed for the node_exporter textfile collector. Run on a
schedule via cron to maintain continuous monitoring.

Inputs:
  --history DIR         Directory of assessment JSON files (required)
  --out PATH            Output .prom file path (required)

Exit Codes:
  0   Metrics written
  2   Invalid input

Usage:
  stave metrics [flags]

Examples:
  stave metrics --history ./history --out /var/lib/node_exporter/stave.prom
  stave metrics --history ./history --out stave.prom

Flags:
  -h, --help             help for metrics
      --history string   directory of assessment JSON files (required)
      --out string       output .prom file path (required)

Global Flags:
      --allow-symlink-output   Allow writing output through symlinks (default: refuse)
      --force                  Allow overwriting existing output files
      --log-file string        Write logs to file (default: stderr)
      --log-format string      Log format: text|json (default "text")
      --log-level string       Log level: debug|info|warn|error (overrides -v)
      --log-timestamps         Include timestamps in logs (breaks determinism)
      --log-timings            Include timing information (breaks determinism)
      --no-color               Disable ANSI colors in output
      --path-mode string       Path rendering in errors/logs: base (basename only) or full (absolute paths) Resolved default may come from STAVE_* env vars, stave.yaml, user config, or built-in.
      --quiet                  Suppress output (exit code only) Resolved default may come from STAVE_* env vars, stave.yaml, user config, or built-in.
      --require-offline        Assert offline operation: fail if proxy env vars (HTTP_PROXY, HTTPS_PROXY, ALL_PROXY) are set
      --sanitize               Sanitize infrastructure identifiers (bucket names, ARNs, policies) from output Resolved default may come from STAVE_* env vars, stave.yaml, user config, or built-in.
      --strict                 Enable strict integrity checks for embedded registries and references
  -v, --verbose count          Increase verbosity (-v=INFO, -vv=DEBUG)
  -y, --yes                    Auto-confirm all interactive prompts (distinct from --force which controls file overwriting)