feat: bootstrap he maintainer skill

he-maintainer/references/scoring-rubric.md

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+# Harness Health Scoring Rubric
+
+Use this when asked to audit or score a repository's harness quality.
+
+## Dimensions
+
+### 1. Project map clarity
+- strong: key directories and entrypoints are documented and current
+- partial: some structure is documented but stale or incomplete
+- weak: little or no useful repo map exists
+
+### 2. Validation commands
+- strong: build, test, lint, and typecheck are clear and runnable
+- partial: some commands exist but are incomplete or ambiguous
+- weak: commands are missing, stale, or unverified
+
+### 3. Fast feedback
+- strong: targeted checks or quick tests exist
+- partial: only slower validation exists
+- weak: no obvious quick validation path
+
+### 4. Task templates
+- strong: reusable templates exist for common work types
+- partial: ad hoc instructions exist but are inconsistent
+- weak: every task must be reinvented
+
+### 5. Guardrails
+- strong: high-risk areas and forbidden changes are explicit
+- partial: some constraints exist but are vague
+- weak: almost no constraints are documented
+
+### 6. Doc-code alignment
+- strong: harness docs match the current repo layout and commands
+- partial: mixed accuracy
+- weak: obviously stale or misleading
+
+## Output format
+
+Keep the score compact. Example:
+
+- project map clarity: partial
+- validation commands: strong
+- fast feedback: weak
+- task templates: weak
+- guardrails: partial
+- doc-code alignment: partial
+
+Top priorities:
+1. Add a fast unit test or package-scoped validation command
+2. Refresh AGENTS.md directory map
+3. Document forbidden change areas