Add quality gates and tuning strategies documentation

- Introduced quality gates specification for skill tuning, detailing quality dimensions, scoring, and gate definitions.
- Added comprehensive tuning strategies for various issue categories, including context explosion, long-tail forgetting, data flow, and agent coordination.
- Created templates for diagnosis reports and fix proposals to standardize documentation and reporting processes.

.claude/skills/skill-tuning/templates/fix-proposal.md

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+# Fix Proposal Template
+
+Template for fix proposal documentation.
+
+## Template
+
+```markdown
+# Fix Proposal: {{fix_id}}
+
+**Strategy**: {{strategy}}
+**Risk Level**: {{risk}}
+**Issues Addressed**: {{issue_ids}}
+
+---
+
+## Description
+
+{{description}}
+
+## Rationale
+
+{{rationale}}
+
+---
+
+## Affected Files
+
+{{#each changes}}
+### {{file}}
+
+**Action**: {{action}}
+
+```diff
+{{diff}}
+```
+
+{{/each}}
+
+---
+
+## Implementation Steps
+
+{{#each implementation_steps}}
+{{@index}}. {{this}}
+{{/each}}
+
+---
+
+## Risk Assessment
+
+| Factor | Assessment |
+|--------|------------|
+| Complexity | {{complexity}} |
+| Reversibility | {{reversible ? 'Yes' : 'No'}} |
+| Breaking Changes | {{breaking_changes}} |
+| Test Coverage | {{test_coverage}} |
+
+**Overall Risk**: {{risk}}
+
+---
+
+## Verification Steps
+
+{{#each verification_steps}}
+- [ ] {{this}}
+{{/each}}
+
+---
+
+## Rollback Plan
+
+{{#if rollback_available}}
+To rollback this fix:
+
+```bash
+{{rollback_command}}
+```
+{{else}}
+_Rollback not available for this fix type._
+{{/if}}
+
+---
+
+## Estimated Impact
+
+{{estimated_impact}}
+```
+
+## Variable Reference
+
+| Variable | Type | Source |
+|----------|------|--------|
+| `fix_id` | string | Generated ID (FIX-001) |
+| `strategy` | string | Fix strategy name |
+| `risk` | string | 'low' \| 'medium' \| 'high' |
+| `issue_ids` | array | Related issue IDs |
+| `description` | string | Human-readable description |
+| `rationale` | string | Why this fix works |
+| `changes` | array | File change objects |
+| `implementation_steps` | array | Step-by-step guide |
+| `verification_steps` | array | How to verify fix worked |
+| `estimated_impact` | string | Expected improvement |
+
+## Usage
+
+```javascript
+function renderFixProposal(fix) {
+  return `# Fix Proposal: ${fix.id}
+
+**Strategy**: ${fix.strategy}
+**Risk Level**: ${fix.risk}
+**Issues Addressed**: ${fix.issue_ids.join(', ')}
+
+---
+
+## Description
+
+${fix.description}
+
+## Rationale
+
+${fix.rationale}
+
+---
+
+## Affected Files
+
+${fix.changes.map(change => `
+### ${change.file}
+
+**Action**: ${change.action}
+
+\`\`\`diff
+${change.diff || change.new_content?.slice(0, 200) || 'N/A'}
+\`\`\`
+`).join('\n')}
+
+---
+
+## Verification Steps
+
+${fix.verification_steps.map(step => `- [ ] ${step}`).join('\n')}
+
+---
+
+## Estimated Impact
+
+${fix.estimated_impact}
+`;
+}
+```
+
+## Fix Strategy Templates
+
+### sliding_window
+
+```markdown
+## Description
+Implement sliding window for conversation history to prevent unbounded growth.
+
+## Changes
+- Add MAX_HISTORY constant
+- Modify history update logic to slice array
+- Update state schema documentation
+
+## Verification
+- [ ] Run skill for 10+ iterations
+- [ ] Verify history.length <= MAX_HISTORY
+- [ ] Check no data loss for recent items
+```
+
+### constraint_injection
+
+```markdown
+## Description
+Add explicit constraint section to each phase prompt.
+
+## Changes
+- Add [CONSTRAINTS] section template
+- Reference state.original_requirements
+- Add reminder before output section
+
+## Verification
+- [ ] Check constraints visible in all phases
+- [ ] Test with specific constraint
+- [ ] Verify output respects constraint
+```
+
+### error_wrapping
+
+```markdown
+## Description
+Wrap all Task calls in try-catch with retry logic.
+
+## Changes
+- Create safeTask wrapper function
+- Replace direct Task calls
+- Add error logging to state
+
+## Verification
+- [ ] Simulate agent failure
+- [ ] Verify graceful error handling
+- [ ] Check retry logic
+```