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>

mcp-servers/gitea/mcp_server/server.py

@@ -435,6 +435,19 @@ class GiteaMCPServer:
                         }
                     }
                 ),
+                Tool(
+                    name="allocate_rfc_number",
+                    description="Allocate the next available RFC number by scanning existing RFC wiki pages",
+                    inputSchema={
+                        "type": "object",
+                        "properties": {
+                            "repo": {
+                                "type": "string",
+                                "description": "Repository name (owner/repo format)"
+                            }
+                        }
+                    }
+                ),
                 # Milestone Tools
                 Tool(
                     name="list_milestones",
@@ -980,6 +993,10 @@ class GiteaMCPServer:
                         limit=arguments.get('limit', 20),
                         repo=arguments.get('repo')
                     )
+                elif name == "allocate_rfc_number":
+                    result = await self.wiki_tools.allocate_rfc_number(
+                        repo=arguments.get('repo')
+                    )
                 # Milestone tools
                 elif name == "list_milestones":
                     result = await self.milestone_tools.list_milestones(**arguments)