feat(skill): add /understand-dashboard skill to launch visualization

New skill command that starts the Vite dev server to visualize the
knowledge graph in a web dashboard.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

understand-anything-plugin/skills/understand-dashboard/SKILL.md

@@ -0,0 +1,53 @@
+---
+name: understand-dashboard
+description: Launch the interactive web dashboard to visualize a codebase's knowledge graph
+argument-hint: [project-path]
+---
+
+# /understand-dashboard
+
+Start the Understand Anything dashboard to visualize the knowledge graph for the current project.
+
+## Instructions
+
+1. Determine the project directory:
+   - If `$ARGUMENTS` contains a path, use that as the project directory
+   - Otherwise, use the current working directory
+
+2. Check that `.understand-anything/knowledge-graph.json` exists in the project directory. If not, tell the user:
+   ```
+   No knowledge graph found. Run /understand first to analyze this project.
+   ```
+
+3. Find the dashboard code. The dashboard is at `packages/dashboard/` relative to this plugin's root directory. Use the Bash tool to resolve the path:
+   ```bash
+   PLUGIN_ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
+   ```
+   Or locate it by checking these paths in order:
+   - `${CLAUDE_PLUGIN_ROOT}/packages/dashboard/`
+   - The parent directory of this skill file, then `../../packages/dashboard/`
+
+4. Install dependencies if needed:
+   ```bash
+   cd <dashboard-dir> && pnpm install --frozen-lockfile 2>/dev/null || pnpm install
+   ```
+
+5. Start the Vite dev server pointing at the project's knowledge graph:
+   ```bash
+   cd <dashboard-dir> && GRAPH_DIR=<project-dir> npx vite --open
+   ```
+   Run this in the background so the user can continue working.
+
+6. Report to the user:
+   ```
+   Dashboard started at http://localhost:5173
+   Viewing: <project-dir>/.understand-anything/knowledge-graph.json
+
+   The dashboard is running in the background. Press Ctrl+C in the terminal to stop it.
+   ```
+
+## Notes
+
+- The dashboard auto-opens in the default browser via `--open`
+- If port 5173 is already in use, Vite will pick the next available port
+- The `GRAPH_DIR` environment variable tells the dashboard where to find the knowledge graph