Add BLADE analysis skill

[jmabry]

Summary

• Add a new nemo-gym-blade-analysis skill for both Claude and Codex agents.
• Document a BLADE-style rollout analysis workflow: artifact inventory, pass@k metrics, task buckets, root-cause taxonomy, evidence rules, and recommendation mapping.
• Keep original CVDP as an opt-in reference and point to the existing in-repo CVDP example rollout artifacts under resources_servers/cvdp/data/.
• Include only Nemotron 3 Super golden analysis artifacts as optional reference material; the large rollout JSONL is intentionally excluded.

Issue: #1585

Validation

• Confirmed existing CVDP example rollouts are already present in resources_servers/cvdp/data/.
• Confirmed no staged .jsonl rollout files were added.
• Ran git diff --cached --check.
• Parsed copied JSON artifacts with python3 -m json.tool.
• Scanned new skill files for private benchmark names, internal URLs, credential strings, and provider route strings.
• Ran three sub-agent review passes; fixed findings around CVDP opt-in loading and sanitized extractor model route metadata.

Note

uvx pre-commit run --files ... could not complete because GitHub returned HTTP 503 while fetching pre-commit-hooks. The relevant local checks were run manually.

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[jmabry]

closing due to signed commit issue that requires pushing a new branch

[jmabry]

superceded by #1591