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] 👋 — this looks like a well-formed bot-generated retrain of the drain3 default log pattern weights from the train-drain3-weights CI workflow. The change is focused and process-compliant.

One minor note:

• No test diff included — since this updates weight data consumed at runtime, it's worth verifying there's a schema/schema-validation test that exercises the updated weights file to ensure it parses correctly and the weight values remain within expected bounds.

If you'd like to close this gap, you can assign this prompt to your coding agent:

Check whether there is an existing test that validates the drain3 default log pattern weights
file (the one updated in this PR) parses without errors and contains well-formed entries.
If no such test exists, add a lightweight schema validation test that loads the weights file
and asserts the structure is valid (e.g., all entries have the expected fields and numeric
weight values).

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