use process PATH for bash tool (#202)

what: default bash PATH to process.env.PATH

why: ensure Nix-provided tools on PATH inside sessions

tests: not run

Co-authored-by: Peter Steinberger <steipete@gmail.com>

src/agents/bash-tools.ts

@@ -36,6 +36,7 @@ const DEFAULT_MAX_OUTPUT = clampNumber(
   150_000,
 );
 const DEFAULT_PATH =
+  process.env.PATH ??
   "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin";
 
 const stringEnum = (