docs: reframe value prop around precision/speed, update Node floor to 20, and expand language/framework coverage

- Benchmark table reordered to lead with tool calls, time, and file reads (the universal wins); cost and tokens moved right with a note that savings are scale-dependent, not a headline claim
- README/introduction/quickstart/installation messaging updated to "surgical context · fewer tool calls · faster answers" framing, dropping the "16% cheaper" headline
- Node engine floor raised from 18 to 20 in CLAUDE.md, package.json description updated
- `codegraph init` now creates and indexes in one step; the `-i` flag is retired (still accepted as a no-op)
- CLI reference expanded with new commands: `explore`, `node`, `unlock`, `daemon`, `telemetry`, `upgrade`, `version`, `help`
- MCP server docs clarified: single `codegraph_explore` tool exposed by default, others unlisted but re-enableable via `CODEGRAPH_MCP_TOOLS`
- Language support adds Objective-C, Astro, and R; framework routes adds Play, Vue Router/Nuxt, and Astro
- API reference documents lower-level exports and embedding requirements (Node 22.5+ for `node:sqlite`)
- Troubleshooting adds WSL/Windows dual-checkout guidance
- How-it-works updated: SQLite backend is now Node's built-in `node:sqlite` in WAL mode, not better-sqlite3/WASM

site/src/content/docs/troubleshooting.md

@@ -20,8 +20,12 @@ Current builds shouldn't: CodeGraph bundles its own Node runtime and uses Node's
 
 ## MCP server not connecting
 
-Ensure the project is initialized/indexed, verify the path in your MCP config, and check that `codegraph serve --mcp` works from the command line.
+Your agent starts the server itself, so you don't launch it by hand. Make sure the project is initialized and indexed (`codegraph status`) and that the path in your MCP config is correct. If it still won't connect, re-run `codegraph install` to rewrite the config.
 
 ## Missing symbols
 
-The MCP server auto-syncs on save (wait a couple of seconds). Run `codegraph sync` manually if needed. Check that the file's language is [supported](/codegraph/reference/languages/) and isn't excluded by `.gitignore`.
+The MCP server auto-syncs on save (wait a couple of seconds). Run `codegraph sync` manually if needed. Check that the file's language is [supported](/codegraph/reference/languages/) and isn't inside a `.gitignore`d or default-excluded directory (e.g. `node_modules`, `dist`).
+
+## Sharing one checkout between Windows and WSL
+
+Don't point both at the same `.codegraph/`: the background-server lock and the SQLite index are tied to the OS that wrote them, and SQLite locking across the WSL2/Windows filesystem boundary is unreliable. Give each side its own index in the same tree by setting `CODEGRAPH_DIR` to a distinct name on one of them — e.g. `CODEGRAPH_DIR=.codegraph-win` on Windows, leaving WSL on the default `.codegraph`. CodeGraph skips any sibling `.codegraph-*` directory when indexing and watching, so the two never trip over each other.