Keep workspace Git refreshes responsive at scale (#2979)

* fix(server): prevent Git watcher fanout stalls

Repository metadata events were refreshing every observed worktree, multiplying Git process submissions and starving workspace create and archive requests behind observation work. Route metadata to the workspaces that depend on it, preserve conservative shared-ref refreshes, and admit interactive lifecycle operations ahead of queued background reads.

* fix(server): preserve Git metadata dependencies

packages/server/src/utils/path.test.ts

@@ -42,6 +42,13 @@ describe("path equivalence", () => {
     );
   });
 
+  test("preserves the casing of Windows relative suffixes", () => {
+    expect(getRealpathAwareRelativePath("C:\\Repo\\.git", "c:\\repo\\.git\\HEAD")).toBe("HEAD");
+    expect(
+      getRealpathAwareRelativePath("C:\\Repo\\.git", "c:\\repo\\.git\\refs\\heads\\FeatureCase"),
+    ).toBe("refs\\heads\\FeatureCase");
+  });
+
   test.skipIf(process.platform === "win32")(
     "derives the contained suffix from a realpath-equivalent root",
     () => {