[Sprint V04.1.0] feat: Add /proposal-status command for proposal tree view

- Create new proposal-status.md command
- Shows all proposals with status (Pending, In Progress, Implemented, Abandoned)
- Tree view of implementations under each proposal
- Links to issues and lessons learned
- Update README with new command documentation

Phase 4 of V04.1.0 Wiki-Based Planning Enhancement.
Closes #164

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

plugins/projman/README.md

@@ -114,6 +114,17 @@ Check current sprint progress.
 
 **When to use:** Daily standup, progress check, deciding what to work on next
 
+### `/proposal-status`
+View proposal and implementation hierarchy.
+
+**What it does:**
+- Lists all change proposals from Gitea Wiki
+- Shows implementations under each proposal with status
+- Displays linked issues and lessons learned
+- Tree-style formatted output
+
+**When to use:** Review progress on multi-sprint features, track proposal lifecycle
+
 ### `/sprint-close`
 Complete sprint and capture lessons learned.
 
@@ -468,6 +479,7 @@ projman/
 │   ├── sprint-start.md
 │   ├── sprint-status.md
 │   ├── sprint-close.md
+│   ├── proposal-status.md
 │   ├── labels-sync.md
 │   ├── initial-setup.md
 │   ├── project-init.md

plugins/projman/commands/proposal-status.md

@@ -0,0 +1,121 @@
+---
+description: View proposal and implementation hierarchy with status tracking
+---
+
+# Proposal Status
+
+View the status of all change proposals and their implementations in the Gitea Wiki.
+
+## Overview
+
+This command provides a tree view of:
+- All change proposals (`Change VXX.X.X: Proposal`)
+- Their implementations (`Change VXX.X.X: Proposal (Implementation N)`)
+- Linked issues and lessons learned
+
+## Workflow
+
+1. **Fetch All Wiki Pages**
+   - Use `list_wiki_pages()` to get all wiki pages
+   - Filter for pages matching `Change V*: Proposal*` pattern
+
+2. **Parse Proposal Structure**
+   - Group implementations under their parent proposals
+   - Extract status from page metadata (In Progress, Implemented, Abandoned)
+
+3. **Fetch Linked Artifacts**
+   - For each implementation, search for issues referencing it
+   - Search lessons learned that link to the implementation
+
+4. **Display Tree View**
+   ```
+   Change V04.1.0: Proposal [In Progress]
+   ├── Implementation 1 [In Progress] - 2026-01-26
+   │   ├── Issues: #161, #162, #163, #164
+   │   └── Lessons: (pending)
+   └── Implementation 2 [Not Started]
+
+   Change V04.0.0: Proposal [Implemented]
+   └── Implementation 1 [Implemented] - 2026-01-20
+       ├── Issues: #150, #151
+       └── Lessons: v4.0.0-impl-1-lessons
+   ```
+
+## MCP Tools Used
+
+- `list_wiki_pages()` - List all wiki pages
+- `get_wiki_page(page_name)` - Get page content for status extraction
+- `list_issues(state, labels)` - Find linked issues
+- `search_lessons(query, tags)` - Find linked lessons
+
+## Status Definitions
+
+| Status | Meaning |
+|--------|---------|
+| **Pending** | Proposal created but no implementation started |
+| **In Progress** | At least one implementation is active |
+| **Implemented** | All planned implementations complete |
+| **Abandoned** | Proposal was cancelled or superseded |
+
+## Filtering Options
+
+The command accepts optional filters:
+
+```
+/proposal-status                    # Show all proposals
+/proposal-status --version V04.1.0  # Show specific version
+/proposal-status --status "In Progress"  # Filter by status
+```
+
+## Example Output
+
+```
+Proposal Status Report
+======================
+
+Change V04.1.0: Wiki-Based Planning Workflow [In Progress]
+├── Implementation 1 [In Progress] - Started: 2026-01-26
+│   ├── Issues: #161 (closed), #162 (closed), #163 (closed), #164 (open)
+│   └── Lessons: (pending - sprint not closed)
+│
+└── (No additional implementations planned)
+
+Change V04.0.0: MCP Server Consolidation [Implemented]
+├── Implementation 1 [Implemented] - 2026-01-15 to 2026-01-20
+│   ├── Issues: #150 (closed), #151 (closed), #152 (closed)
+│   └── Lessons:
+│       • Sprint 15 - MCP Server Symlink Best Practices
+│       • Sprint 15 - Venv Path Resolution in Plugins
+│
+└── (Complete)
+
+Change V03.2.0: Label Taxonomy Sync [Implemented]
+└── Implementation 1 [Implemented] - 2026-01-10 to 2026-01-12
+    ├── Issues: #140 (closed), #141 (closed)
+    └── Lessons:
+        • Sprint 14 - Organization vs Repository Labels
+
+Summary:
+- Total Proposals: 3
+- In Progress: 1
+- Implemented: 2
+- Pending: 0
+```
+
+## Implementation Notes
+
+**Page Name Parsing:**
+- Proposals: `Change VXX.X.X: Proposal` or `Change Sprint-NN: Proposal`
+- Implementations: `Change VXX.X.X: Proposal (Implementation N)`
+
+**Status Extraction:**
+- Parse the `> **Status:**` line from page metadata
+- Default to "Unknown" if not found
+
+**Issue Linking:**
+- Search for issues containing wiki link in body
+- Or search for issues with `[Sprint XX]` prefix matching implementation
+
+**Lesson Linking:**
+- Search lessons with implementation link in metadata
+- Or search by version/sprint tags