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.

---

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• github.com

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "github.com"

See Network Configuration for more information.

Generated by 👨‍🍳 PR Sous Chef · pi · gpt54 · 9.2 AIC · ⌖ 8.6 AIC · ⊞ 9.2K · ◷
_{Comment /souschef to run again}

[gh-aw-bot]

@copilot Please refresh this PR for maintainer review: re-run the pr-finisher skill, confirm the branch is up to date with main, and address any remaining review or check issues before handing back.

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• github.com

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "github.com"

See Network Configuration for more information.

Generated by 👨‍🍳 PR Sous Chef · pi · gpt54 · 9.2 AIC · ⌖ 8.6 AIC · ⊞ 9.2K · ◷
_{Comment /souschef to run again}

[Copilot]

@copilot Please refresh this PR for maintainer review: re-run the pr-finisher skill, confirm the branch is up to date with main, and address any remaining review or check issues before handing bac...

Confirmed the branch is already up to date with main. Ran make fmt (reformatted default_weights.json with prettier), make lint, and make test-unit (no Go changes, nothing to test) — all pass. No open review threads to address. Pushed in c536072.