feat(#26): implement mosaic-plugin-gantt skill

packages/skills/gantt/README.md

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+# Mosaic Stack Gantt Plugin
+
+Clawdbot skill for querying and analyzing project timelines, task dependencies, and schedules from Mosaic Stack's Gantt/Project API.
+
+## Features
+
+- Query project timelines and task lists
+- Check task dependencies and blocking relationships
+- Get project status overviews with statistics
+- Identify critical path items in projects
+- PDA-friendly language (supportive, non-judgmental)
+
+## Installation
+
+1. **Copy skill to Clawdbot plugins directory:**
+   ```bash
+   cp -r ~/src/mosaic-skills/gantt ~/.claude/plugins/mosaic-plugin-gantt
+   ```
+
+2. **Set up environment variables:**
+   
+   Add to your `.env` or shell profile:
+   ```bash
+   export MOSAIC_API_URL="http://localhost:3000/api"
+   export MOSAIC_WORKSPACE_ID="your-workspace-uuid"
+   export MOSAIC_API_TOKEN="your-api-token"
+   ```
+
+3. **Verify installation:**
+   ```bash
+   ~/.claude/plugins/mosaic-plugin-gantt/gantt-api.sh projects
+   ```
+
+## Usage
+
+### Via Clawdbot
+
+Once installed, you can ask Clawdbot:
+
+- "Show me the timeline for Project Alpha"
+- "What blocks task 'Implement Auth'?"
+- "What's the critical path for Q1 release?"
+- "Show all high-priority tasks due this week"
+- "Give me a status overview of Project Beta"
+
+### Via Command Line
+
+The `gantt-api.sh` helper script can be used directly:
+
+```bash
+# List all projects
+./gantt-api.sh projects
+
+# Get project details with tasks
+./gantt-api.sh project <project-id>
+
+# Get tasks for a project
+./gantt-api.sh tasks <project-id>
+
+# Get task details
+./gantt-api.sh task <task-id>
+
+# Get dependency chain for a task
+./gantt-api.sh dependencies <task-id>
+
+# Calculate critical path for a project
+./gantt-api.sh critical-path <project-id>
+
+# Find tasks by status
+./gantt-api.sh status IN_PROGRESS
+./gantt-api.sh status COMPLETED <project-id>
+```
+
+## API Reference
+
+### Endpoints
+
+- `GET /api/projects` - List projects (paginated)
+- `GET /api/projects/:id` - Get project with tasks
+- `GET /api/tasks` - List tasks with filters
+  - Query params: `projectId`, `status`, `priority`, `assigneeId`, `page`, `limit`
+
+### Authentication
+
+All requests require headers:
+- `X-Workspace-Id`: Workspace UUID
+- `Authorization`: Bearer {token}
+
+## License
+
+MIT