[codex] add machine-readable run summaries

[stacknil]

Summary

• emit a compact summary.json for each pipeline run alongside the existing CSV and PNG outputs
• include the summary artifact in both bundled sample output directories
• add focused e2e checks for summary creation and core fields on the default and richer sample paths

Summary fields

• input path
• output directory
• normalized event count
• window count
• feature row count
• alert count
• triggered rule names
• triggered rule counts
• cooldown seconds
• generated artifact paths

Validation

• pytest

Notes

• both configs/default.yaml and configs/richer_sample.yaml now produce summary.json
• existing default and richer sample CSV/PNG outputs are unchanged; this PR adds the summary artifact beside them

Fixes #10

[chatgpt-codex-connector]

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[stacknil]

@codex review
Focus on:

• whether null
  ules is now handled safely in the summary-writing path
• whether the new test covers the regression without widening scope

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