Hawthorn bd45947941 feat(skills,agents): add agent-self-evaluation skill and agent-evaluator persona
Add structured 5-axis self-evaluation framework for agent output quality:
- Accuracy, Completeness, Clarity, Actionability, Conciseness
- Evidence-based scoring with concrete improvement suggestions
- Standalone Python evaluator script with keyword heuristics
- Detailed scoring anchors reference guide
- High-score and low-score annotated examples
- Reusable evaluation report template
- Optional hook integration for session-stop evaluation

Agent persona (agent-evaluator) provides a dedicated subagent
for applying the rubric to agent output with tool-backed verification.

All files tested: Python script runs, examples score correctly
(high 4.2, low 3.4), frontmatter parses clean, 183 lines (under 500).
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