feat(directory): CODEGRAPH_DIR env var to override the index dir name (#636) (#741)

Two environments that share one working tree — most concretely Windows
and WSL — can't safely share a single `.codegraph/`: the daemon lockfile
records a platform-specific pid + socket (named pipe vs Unix socket), and
SQLite locking across the WSL2/Windows filesystem boundary is unreliable,
so two daemons over one index risks corruption.

Add a `CODEGRAPH_DIR` env var (default `.codegraph`) that overrides the
per-project data directory name, so each environment keeps its own index
in the same tree (e.g. `CODEGRAPH_DIR=.codegraph-win` on Windows). The
name is resolved live and validated (rejects separators / `..` / absolute,
falling back to the default with a one-time stderr warning). Indexing and
file-watching now skip ANY `.codegraph-*` sibling so neither side trips
over the other's data.

Routes the previously-hardcoded `.codegraph` literals (db path, lockfile,
error log, watcher ignore, file-scan skip, installer) through the
resolver. No extraction-version bump — index content is unchanged.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -25,6 +25,7 @@ and adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 - A Razor/Blazor type reference now resolves through the component's `@using` namespaces — including the folder's cascading `_Imports.razor` — so a simple name that exists in several namespaces lands on the right one. A `@model` / `<MyComponent>` / `@code` reference to `CatalogBrand` resolves to the `@using`'d DTO (`BlazorShared.Models.CatalogBrand`) rather than a same-named domain entity. (ASP.NET, Blazor)
 - `codegraph status --json` now also reports the running CLI `version`, the index directory (`indexPath`), and a `lastIndexed` timestamp (ISO-8601, or null when nothing's indexed yet), so CI and scripts can pin the CLI version and check index freshness from a single command. A matching `CodeGraph.getLastIndexedAt()` library method exposes the same freshness check without shelling out. Thanks @12122J and @eddieran. (#329)
 - TypeScript service/RPC contracts defined as a tuple of generic types — `type MyServiceList = [Service<'query_apply_record', …>, Service<'apply_confirm', …>]` — now index each entry's string-literal name as a searchable symbol. Previously these names existed only as type arguments, so `codegraph query query_apply_record` found nothing even though the names are the app's primary API surface. The pattern is common in typed RPC / BFF clients and mock servers where the types are the source of truth for a runtime proxy object. Utility types (`Pick`, `Omit`, `Record`) and route paths are deliberately left out to avoid noise. Thanks @jiezhiyong. (#634) (TypeScript)
+- New `CODEGRAPH_DIR` environment variable sets the per-project index directory name (default `.codegraph`). This lets one working tree hold two independent indexes — most usefully when you open the same checkout from both **Windows** and **WSL**, which can't safely share a single `.codegraph/`: the background-server lock and the SQLite database are tied to the OS that wrote them, and SQLite locking across the WSL2/Windows filesystem boundary is unreliable. Set `CODEGRAPH_DIR=.codegraph-win` on the Windows side, leave WSL on the default, and each keeps its own index in the same folder without clobbering the other. CodeGraph also skips any sibling `.codegraph-*` directory when indexing and watching, so neither environment trips over the other's data. Thanks @rrtt2323. (#636)
 
 ### Fixes