Analyze failures skill - #3647
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Replace `scripts/analyze_failures.sh` with a Claude Code skill that detects a regression vs node-upgrade run and follows the matching prompt from `agent_docs/`. The skill also answers where a run's logs and artifacts live, both for saved run directories and for local runs against a dev cluster. Sharpen both analysis prompts: describe the `cluster_artifacts/` state dirs and their contents, say what `errors_all.log` actually greps, point at `start-cluster.log` / `supervisord.log` when the cluster fails to start, and note that load generator logs mean the testnet was under constant load during the run.
Unpack step: artifacts downloaded from a CI run contain only the `*.tar.xz` archives, while a locally produced run dir keeps both the archives and the unpacked dirs, so unpack what is missing first. Detection: match results as dir or tarball, and stop asking instead of falling back to the regression prompt - an upgrade run that dies before step1's pytest produces no results at all. Drop the duplicated path map in favour of the prompt files' inputs list, use the same temp dir fallbacks as `runner/copy_artifacts.sh`, and stop implying that `$1` gets substituted in the skill body. Prompts: don't hardcode a 3-pool testnet, list the rotated logs and the `nodes/` and `shelley/` subdirs that `_copy_state_dir_content` also saves, note the fallback names of the state dirs, and warn that `grep_errors.sh` skips rotated logs.
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