refactor(projman): extract skills and consolidate commands

Major refactoring of projman plugin architecture:

Skills Extraction (17 new files):
- Extracted reusable knowledge from commands and agents into skills/
- branch-security, dependency-management, git-workflow, input-detection
- issue-conventions, lessons-learned, mcp-tools-reference, planning-workflow
- progress-tracking, repo-validation, review-checklist, runaway-detection
- setup-workflows, sprint-approval, task-sizing, test-standards, wiki-conventions

Command Consolidation (17 → 12 commands):
- /setup: consolidates initial-setup, project-init, project-sync (--full/--quick/--sync)
- /debug: consolidates debug-report, debug-review (report/review modes)
- /test: consolidates test-check, test-gen (run/gen modes)
- /sprint-status: absorbs sprint-diagram via --diagram flag

Architecture Cleanup:
- Remove plugin-level mcp-servers/ symlinks (6 plugins)
- Remove plugin README.md files (12 files, ~2000 lines)
- Update all documentation to reflect new command structure
- Fix documentation drift in CONFIGURATION.md, COMMANDS-CHEATSHEET.md

Commands are now thin dispatchers (~20-50 lines) that reference skills.
Agents reference skills for domain knowledge instead of inline content.

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

plugins/clarity-assist/README.md

@@ -1,103 +0,0 @@
-# clarity-assist
-
-Prompt optimization and requirement clarification plugin with neurodivergent-friendly accommodations.
-
-## Overview
-
-clarity-assist helps transform vague, incomplete, or ambiguous requests into clear, actionable specifications. It uses a structured 4-D methodology (Deconstruct, Diagnose, Develop, Deliver) and ND-friendly communication patterns.
-
-## Commands
-
-| Command | Description |
-|---------|-------------|
-| `/clarify` | Full 4-D prompt optimization for complex requests |
-| `/quick-clarify` | Rapid single-pass clarification for simple requests |
-
-## Features
-
-### 4-D Methodology
-
-1. **Deconstruct** - Break down the request into components
-2. **Diagnose** - Analyze gaps and potential issues
-3. **Develop** - Gather clarifications through structured questions
-4. **Deliver** - Produce refined specification
-
-### ND-Friendly Design
-
-- **Option-based questioning** - Always provide 2-4 concrete choices
-- **Chunked questions** - Ask 1-2 questions at a time
-- **Context for questions** - Explain why you're asking
-- **Conflict detection** - Check previous answers before new questions
-- **Progress acknowledgment** - Summarize frequently
-
-### Escalation Protocol
-
-When requests are complex or users seem overwhelmed:
-- Acknowledge complexity
-- Offer to focus on one aspect at a time
-- Build incrementally
-
-## Installation
-
-Add to your project's `.claude/settings.json`:
-
-```json
-{
-  "plugins": ["clarity-assist"]
-}
-```
-
-## Usage
-
-### Full Clarification
-
-```
-/clarify
-
-[Your vague or complex request here]
-```
-
-### Quick Clarification
-
-```
-/quick-clarify
-
-[Your mostly-clear request here]
-```
-
-## Configuration
-
-No configuration required. The plugin uses sensible defaults.
-
-## Output Format
-
-After clarification, you receive a structured specification:
-
-```markdown
-## Clarified Request
-
-### Summary
-[Description of what will be built]
-
-### Scope
-**In Scope:** [items]
-**Out of Scope:** [items]
-
-### Requirements
-[Prioritized table]
-
-### Assumptions
-[List of assumptions]
-```
-
-## Documentation
-
-- [Neurodivergent Support Guide](docs/ND-SUPPORT.md) - How clarity-assist supports ND users with executive function challenges and cognitive differences
-
-## Integration
-
-For CLAUDE.md integration instructions, see `claude-md-integration.md`.
-
-## License
-
-MIT