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

packages/skills/README.md

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+# Mosaic Stack Skills
+
+Clawdbot skills for integrating with Mosaic Stack services.
+
+## Available Skills
+
+### gantt
+Query and analyze 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)
+
+**Usage:**
+See [gantt/README.md](./gantt/README.md) for detailed documentation.
+
+## Installation
+
+Skills can be installed individually to Clawdbot:
+
+```bash
+# Install gantt skill
+cp -r packages/skills/gantt ~/.claude/plugins/mosaic-plugin-gantt
+```
+
+## Development
+
+Each skill follows the Clawdbot skill structure:
+- `SKILL.md` - Skill definition and usage documentation
+- `.claude-plugin/plugin.json` - Plugin metadata
+- `README.md` - User documentation
+- Implementation files (TypeScript, Bash, etc.)
+
+## License
+
+MIT