feat(projman): add RFC system for feature tracking

Implement wiki-based Request for Comments system for capturing,
reviewing, and tracking feature ideas through their lifecycle.

New commands:
- /rfc-create: Create RFC from conversation or clarified spec
- /rfc-list: List RFCs grouped by status
- /rfc-review: Submit Draft RFC for review
- /rfc-approve: Approve RFC for sprint planning
- /rfc-reject: Reject RFC with documented reason

RFC lifecycle: Draft → Review → Approved → Implementing → Implemented

Integration:
- /sprint-plan detects approved RFCs and offers selection
- /sprint-close updates RFC status on completion
- clarity-assist suggests /rfc-create for feature ideas

New MCP tool: allocate_rfc_number

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

docs/COMMANDS-CHEATSHEET.md

@@ -21,6 +21,11 @@ Quick reference for all commands in the Leo Claude Marketplace.
 | **projman** | `/suggest-version` | | X | Analyze CHANGELOG and recommend semantic version bump |
 | **projman** | `/proposal-status` | | X | View proposal and implementation hierarchy with status |
 | **projman** | `/clear-cache` | | X | Clear plugin cache to force fresh configuration reload |
+| **projman** | `/rfc-create` | | X | Create new RFC from conversation or clarified spec |
+| **projman** | `/rfc-list` | | X | List all RFCs grouped by status |
+| **projman** | `/rfc-review` | | X | Submit Draft RFC for review |
+| **projman** | `/rfc-approve` | | X | Approve RFC in Review status for sprint planning |
+| **projman** | `/rfc-reject` | | X | Reject RFC with documented reason |
 | **git-flow** | `/commit` | | X | Create commit with auto-generated conventional message |
 | **git-flow** | `/commit-push` | | X | Commit and push to remote in one operation |
 | **git-flow** | `/commit-merge` | | X | Commit current changes, then merge into target branch |
@@ -129,6 +134,22 @@ Quick reference for all commands in the Leo Claude Marketplace.
 
 ## Dev Workflow Examples
 
+### Example 0: RFC-Driven Feature Development
+
+Full workflow from idea to implementation using RFCs:
+
+```
+1. /clarify                  # Clarify the feature idea
+2. /rfc-create               # Create RFC from clarified spec
+   ... refine RFC content ...
+3. /rfc-review 0001          # Submit RFC for review
+   ... review discussion ...
+4. /rfc-approve 0001         # Approve RFC for implementation
+5. /sprint-plan              # Select approved RFC for sprint
+   ... implement feature ...
+6. /sprint-close             # Complete sprint, RFC marked Implemented
+```
+
 ### Example 1: Starting a New Feature Sprint
 
 A typical workflow for planning and executing a feature sprint: