refactor: extract skills from commands across 8 plugins

Refactored commands to extract reusable skills following the
Commands → Skills separation pattern. Each command is now <50 lines
and references skill files for detailed knowledge.

Plugins refactored:
- claude-config-maintainer: 5 commands → 7 skills
- code-sentinel: 3 commands → 2 skills
- contract-validator: 5 commands → 6 skills
- data-platform: 10 commands → 6 skills
- doc-guardian: 5 commands → 6 skills (replaced nested dir)
- git-flow: 8 commands → 7 skills

Skills contain: workflows, validation rules, conventions,
reference data, tool documentation

Commands now contain: YAML frontmatter, agent assignment,
skills list, brief workflow steps, parameters

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plugins/claude-config-maintainer/skills/analysis-workflow.md

@@ -0,0 +1,112 @@
+# CLAUDE.md Analysis Workflow
+
+This skill defines the workflow for analyzing CLAUDE.md files.
+
+## Analysis Steps
+
+1. **Locate File** - Find CLAUDE.md in project root
+2. **Parse Structure** - Extract headers and sections
+3. **Evaluate Content** - Score against criteria
+4. **Detect Plugins** - Identify active marketplace plugins
+5. **Check Integration** - Verify plugin references
+6. **Generate Report** - Provide scored assessment
+
+## Content Analysis
+
+### What to Check
+
+| Area | Check For |
+|------|-----------|
+| Structure | Header hierarchy, section ordering, grouping |
+| Clarity | Clear instructions, examples, unambiguous language |
+| Completeness | Required sections present, workflows documented |
+| Conciseness | No redundancy, efficient density, appropriate length |
+
+### Required Sections Check
+
+1. Project Overview - present?
+2. Quick Start - present with commands?
+3. Critical Rules - present?
+4. **Pre-Change Protocol** - present? (HIGH PRIORITY if missing)
+
+## Plugin Integration Analysis
+
+### Detection Method
+
+1. Read `.claude/settings.local.json` for enabled MCP servers
+2. Map MCP servers to plugins:
+   - `gitea` -> projman
+   - `netbox` -> cmdb-assistant
+3. Check for hook-based plugins (project-hygiene)
+4. Scan CLAUDE.md for plugin references
+
+### Coverage Scoring
+
+For each detected plugin, verify CLAUDE.md contains:
+- Plugin section header or mention
+- Available commands documentation
+- MCP tools reference (if applicable)
+- Usage guidelines
+
+Coverage = (plugins referenced / plugins detected) * 100%
+
+## Report Format
+
+```
+CLAUDE.md Analysis Report
+=========================
+
+File: /path/to/project/CLAUDE.md
+Lines: N
+Last Modified: YYYY-MM-DD
+
+Overall Score: NN/100
+
+Category Scores:
+- Structure:    NN/25 (Rating)
+- Clarity:      NN/25 (Rating)
+- Completeness: NN/25 (Rating)
+- Conciseness:  NN/25 (Rating)
+
+Strengths:
++ [Positive finding]
+
+Issues Found:
+
+N. [SEVERITY] Issue description (location)
+   Context explaining the problem.
+   Impact: What happens if not fixed.
+
+Recommendations:
+N. Action to take (priority: high/medium/low)
+
+---
+
+Plugin Integration Analysis
+===========================
+
+Detected Active Plugins:
+  [check] plugin-name (via detection method)
+
+Plugin Coverage: NN% (N/N plugins referenced)
+
+Missing Integration Content:
+N. plugin-name
+   What to add.
+```
+
+## Issue Severity
+
+| Level | When to Use |
+|-------|-------------|
+| HIGH | Missing mandatory sections, security issues |
+| MEDIUM | Missing recommended content, duplicate content |
+| LOW | Formatting issues, minor improvements |
+
+## Follow-Up Actions
+
+After analysis, offer:
+1. Implement all content recommendations
+2. Add missing plugin integrations
+3. Do both (recommended)
+4. Show preview of changes first