chore: init from code-review-graph-main snapshot (v2.3.7)

code-review-graph-vscode/media/walkthrough/build.md

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+## Build Your Graph
+
+Click the button above to parse your codebase and create a knowledge graph.
+
+This usually takes ~10 seconds for a 500-file project. The graph will be stored locally in `.code-review-graph/graph.db`.
+
+After the initial build, the graph updates automatically when you save files.

code-review-graph-vscode/media/walkthrough/explore.md

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+## Explore Your Code
+
+Open the **Code Graph** panel in the activity bar to browse your codebase structure.
+
+**Try these commands** (Ctrl+Shift+P):
+- **Code Graph: Show Blast Radius** -- See what's impacted when you change code
+- **Code Graph: Find Callers** -- Find all callers of a function
+- **Code Graph: Find Tests** -- Find tests for any function
+- **Code Graph: Search** -- Search across your entire code graph
+- **Code Graph: Show Graph** -- Open the interactive graph visualization

code-review-graph-vscode/media/walkthrough/install.md

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+## Install the Backend
+
+code-review-graph needs a Python backend to parse your codebase.
+
+**Requirements:** Python 3.10+
+
+**Recommended:** Install via [uv](https://docs.astral.sh/uv/):
+```bash
+uv pip install code-review-graph
+```
+
+**Alternatives:**
+```bash
+pipx install code-review-graph
+# or
+pip install code-review-graph
+```