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>

plugins/projman/commands/rfc-list.md

@@ -0,0 +1,98 @@
+---
+description: List all RFCs grouped by status from RFC-Index wiki page
+agent: planner
+---
+
+# List RFCs
+
+## Skills Required
+
+- skills/mcp-tools-reference.md
+- skills/rfc-workflow.md
+
+## Purpose
+
+Display all RFCs grouped by their lifecycle status. Highlights "Approved" RFCs that are ready for sprint planning.
+
+## Invocation
+
+Run `/rfc-list` to see all RFCs.
+
+Optional filters:
+- `/rfc-list approved` - Show only approved RFCs
+- `/rfc-list draft` - Show only draft RFCs
+- `/rfc-list review` - Show only RFCs in review
+
+## Workflow
+
+1. **Fetch RFC-Index**
+   - Call `get_wiki_page` for "RFC-Index"
+   - Handle missing index gracefully
+
+2. **Parse Sections**
+   - Extract tables from each status section
+   - Parse RFC number, title, and metadata from each row
+
+3. **Display Results**
+   - Group by status
+   - Highlight Approved section (ready for planning)
+   - Show counts per status
+
+## Visual Output
+
+```
++----------------------------------------------------------------------+
+|  PROJMAN - RFC Index                                                 |
++----------------------------------------------------------------------+
+
+## Approved (Ready for Sprint Planning)
+
+| RFC | Title | Champion | Created |
+|-----|-------|----------|---------|
+| RFC-0003 | Feature X | @user | 2026-01-15 |
+| RFC-0007 | Enhancement Y | @user | 2026-01-28 |
+
+## In Review (2)
+
+| RFC | Title | Author | Created |
+|-----|-------|--------|---------|
+| RFC-0004 | Feature Y | @user | 2026-01-20 |
+| RFC-0008 | Idea Z | @user | 2026-01-29 |
+
+## Draft (3)
+
+| RFC | Title | Author | Created |
+|-----|-------|--------|---------|
+| RFC-0005 | Concept A | @user | 2026-01-22 |
+| RFC-0009 | Proposal B | @user | 2026-01-30 |
+| RFC-0010 | Sketch C | @user | 2026-01-30 |
+
+## Implementing (1)
+
+| RFC | Title | Sprint | Started |
+|-----|-------|--------|---------|
+| RFC-0002 | Feature W | Sprint 18 | 2026-01-22 |
+
+## Implemented (1)
+
+| RFC | Title | Completed | Release |
+|-----|-------|-----------|---------|
+| RFC-0001 | Initial Feature | 2026-01-10 | v5.0.0 |
+
+## Rejected (0)
+
+(none)
+
+## Stale (0)
+
+(none)
+
+---
+Total: 10 RFCs | 2 Approved | 1 Implementing
+```
+
+## Edge Cases
+
+- **No RFC-Index**: Display message "No RFCs yet. Create one with /rfc-create"
+- **Empty sections**: Show "(none)" for empty status categories
+- **Filter applied**: Only show matching section, still show total counts