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/projman/skills/issue-conventions.md

@@ -0,0 +1,130 @@
+---
+name: issue-conventions
+description: Issue title format, wiki references, and creation standards
+---
+
+# Issue Conventions
+
+## Purpose
+
+Defines standard formats for issue titles, bodies, and wiki references.
+
+## When to Use
+
+- **Planner agent**: When creating issues during sprint planning
+- **Commands**: `/sprint-plan`
+
+---
+
+## Title Format (MANDATORY)
+
+```
+[Sprint XX] <type>: <description>
+```
+
+### Types
+
+| Type | Use For |
+|------|---------|
+| `feat` | New feature |
+| `fix` | Bug fix |
+| `refactor` | Code refactoring |
+| `docs` | Documentation |
+| `test` | Test additions/changes |
+| `chore` | Maintenance tasks |
+
+### Examples
+
+- `[Sprint 17] feat: Add user email validation`
+- `[Sprint 17] fix: Resolve login timeout issue`
+- `[Sprint 18] refactor: Extract authentication module`
+- `[Sprint 18] test: Add JWT token edge case tests`
+- `[Sprint 19] docs: Update API documentation`
+
+---
+
+## Issue Body Structure
+
+Every issue body MUST include:
+
+```markdown
+## Description
+[Clear description of the task]
+
+## Implementation
+**Wiki:** [Change VXX.X.X (Impl N)](wiki-link)
+
+## Acceptance Criteria
+- [ ] Criteria 1
+- [ ] Criteria 2
+- [ ] Criteria 3
+
+## Technical Notes
+[Optional: Architecture decisions, constraints, considerations]
+```
+
+---
+
+## Wiki Reference (MANDATORY)
+
+Every issue MUST reference its implementation wiki page:
+
+```markdown
+## Implementation
+**Wiki:** [Change V4.1.0 (Impl 1)](https://gitea.example.com/org/repo/wiki/Change-V4.1.0%3A-Proposal-(Implementation-1))
+```
+
+This enables:
+- Traceability between issues and proposals
+- Context for the broader feature being implemented
+- Connection to lessons learned
+
+---
+
+## Issue Creation Example
+
+```python
+create_issue(
+    repo="org/repo",
+    title="[Sprint 17] feat: Implement JWT generation",
+    body="""## Description
+Create a JWT token generation service for user authentication.
+
+## Implementation
+**Wiki:** [Change V1.2.0 (Impl 1)](wiki-link)
+
+## Acceptance Criteria
+- [ ] Generate tokens with user_id, email, expiration
+- [ ] Use HS256 algorithm
+- [ ] Include token refresh logic
+- [ ] Unit tests cover all paths
+
+## Technical Notes
+- Token expiration: 24 hours
+- Refresh window: last 4 hours of validity
+- See Sprint 12 lesson on token refresh edge cases
+""",
+    labels=["Type/Feature", "Priority/High", "Component/Auth", "Tech/Python", "Efforts/M"],
+    milestone=17
+)
+```
+
+---
+
+## Auto-Close Keywords
+
+Use in commit messages to auto-close issues:
+- `Closes #XX`
+- `Fixes #XX`
+- `Resolves #XX`
+
+Example commit:
+```
+feat: implement JWT token generation
+
+- Add generate_token(user_id, email) function
+- Add verify_token(token) function
+- Include refresh logic per Sprint 12 lesson
+
+Closes #45
+```