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[bot] 👋 — thanks for the automated update to the Drain3 default log pattern weights! Keeping these trained on the latest workflow run logs is a great way to ensure anomaly analysis stays accurate and current.

One thing worth considering:

• No test coverage — the diff touches pkg/agentdrain/data/default_weights.json but doesn't include any test changes. Even for a data-only weights update, a lightweight regression test (e.g. verifying the JSON is well-formed, that required top-level keys like error, warning, etc. are present, and that cluster entries meet a minimum schema) would add confidence that automated retraining doesn't silently produce malformed data.

If you'd like a hand adding that coverage, you can assign this prompt to your coding agent:

Add a regression test for pkg/agentdrain/data/default_weights.json.
The test should:
1. Parse the JSON file and confirm it is well-formed.
2. Assert that the top-level keys expected by the agentdrain package (e.g. "error", "warning", "info") are present.
3. Assert that each key's value contains a "clusters" array with at least one entry that has "id", "size", "stage", and "template" fields.
Place the test in the existing test suite for the agentdrain package.

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