Lspinfo lists pardes's own dependency imports only for a file in pardes's tree

The in-process ZLS's report listed the module map of the build pardes came from (vaxis, ghostty and the rest) for any .zig file, a project that has none of them included. It now lists them only for a file in that tree (project_root, a build option), and says there are none for any other.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 2 insertions, 0 deletions

diff --git a/build.zig b/build.zig
index 79de8a81..b43f3fd9 100644
--- a/build.zig
+++ b/build.zig
@@ -752,6 +752,8 @@ pub fn build(b: *std.Build) void {
     for ([_]?*std.Build.Step.Options{ opts, gui_opts }) |maybe| if (maybe) |o| {
         o.addOption([]const []const u8, "module_names", mod_names);
         o.addOption([]const []const u8, "module_roots", mod_roots);
+        // Whose imports those are: a .zig file outside this tree has none of them.
+        o.addOption([]const u8, "project_root", b.build_root.path orelse "");
     };
 
     const iso_off = b.addOptions();