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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>