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-create.md

@@ -0,0 +1,84 @@
+---
+description: Create a new RFC (Request for Comments) from conversation or clarified specification
+agent: planner
+---
+
+# Create RFC
+
+## Skills Required
+
+- skills/mcp-tools-reference.md
+- skills/rfc-workflow.md
+- skills/rfc-templates.md
+
+## Purpose
+
+Create a new RFC wiki page to track a feature idea, proposal, or enhancement through the review lifecycle. RFCs provide a structured way to document, discuss, and approve changes before implementation.
+
+## Invocation
+
+Run `/rfc-create` with optional context:
+- After `/clarify` to convert clarified spec to RFC
+- With description of feature idea
+- From conversation context
+
+## Workflow
+
+1. **Gather Input**
+   - Check if conversation has clarified specification (from `/clarify`)
+   - If no context: prompt for Summary, Motivation, and initial Design
+   - Extract author from context or prompt
+
+2. **Allocate RFC Number**
+   - Call `allocate_rfc_number` MCP tool
+   - Get next sequential 4-digit number
+
+3. **Create RFC Page**
+   - Use template from `skills/rfc-templates.md`
+   - Fill in frontmatter (number, title, status=Draft, author, dates)
+   - Populate Summary, Motivation, Detailed Design sections
+   - Create wiki page: `RFC-NNNN: Title`
+
+4. **Update RFC-Index**
+   - Fetch RFC-Index (create if doesn't exist)
+   - Add entry to "## Draft" section
+   - Update wiki page
+
+5. **Confirm Creation**
+   - Display RFC number and wiki link
+   - Remind about next steps (refine → `/rfc-review`)
+
+## Visual Output
+
+```
++----------------------------------------------------------------------+
+|  PROJMAN - RFC Creation                                              |
++----------------------------------------------------------------------+
+
+RFC-0001: [Title] created successfully!
+
+Status: Draft
+Wiki: [link to RFC page]
+
+Next steps:
+- Refine the RFC with additional details
+- When ready: /rfc-review 0001 to submit for review
+```
+
+## Input Mapping
+
+When converting from `/clarify` output:
+
+| Clarify Section | RFC Section |
+|-----------------|-------------|
+| Problem/Context | Motivation > Problem Statement |
+| Goals/Outcomes | Motivation > Goals |
+| Scope/Requirements | Detailed Design > Overview |
+| Constraints | Non-Goals or Detailed Design |
+| Success Criteria | Testing Strategy |
+
+## Edge Cases
+
+- **No RFC-Index exists**: Create it with empty sections
+- **User provides minimal input**: Create minimal RFC template, note sections to fill
+- **Duplicate title**: Proceed (RFC numbers are unique, titles don't need to be)