chore: update drain3 default log pattern weights

[github-actions]

This pull request updates the default Drain3 log pattern weights (pkg/agentdrain/data/default_weights.json) by training on the most recent workflow run logs.

What changed

• Re-trained log template clusters from the latest run logs using gh aw logs --train
• Copied resulting drain3_weights.json to the embedded defaults path

How to verify

1. Build the binary with make build
2. Run gh aw audit or gh aw logs --train and confirm the anomaly analysis reflects the updated patterns

This PR was created automatically by the train-drain3-weights workflow.

[github-actions]

Hey @github-actions 👋 — thanks for the automated maintenance update! Refreshing the Drain3 default log pattern weights from the latest training run is exactly the kind of routine upkeep that keeps anomaly detection accurate.

This PR is clean: single file changed, clear description, direct link to the triggering workflow run, and handy verification steps. The CI suite (make build + make test) will exercise the code in pkg/agentdrain/ that consumes default_weights.json, so the existing tests in anomaly_test.go and miner_test.go provide the relevant coverage — no additional test changes are needed for a pure data-file retrain.

⚠️ Soft flag: The contribution checker noted tests: no because the diff touches no _test.go files. This is expected for a weights-only update and should not block merging once CI is green. If any CI check fails on the updated default_weights.json, check whether any assertions in anomaly_test.go or miner_test.go rely on specific cluster IDs or template counts that may have shifted after retraining.

Generated by Contribution Check · ● 3.2M · ◷