Find hidden agent plan files in workspace suggestions (#6641)

* fix(server): find hidden agent plan files in workspace suggestions

Workspace autocomplete skipped the editor's plan directory while traversing
other known agent directories. Include it in the existing discovery policy
and cover basename and partial-path queries through the daemon client.

Co-authored-by: X <X@16x.org>

* test(server): give plan suggestion queries explicit expectations

---------

Co-authored-by: paseo-bot[bot] <266920839+paseo-bot[bot]@users.noreply.github.com>
Co-authored-by: X <X@16x.org>

packages/server/src/server/daemon-e2e/filesystem.e2e.test.ts

@@ -23,6 +23,49 @@ afterEach(async () => {
 }, 60000);
 
 describe("file explorer", () => {
+  test.each([
+    {
+      query: "implementation",
+      expectedPaths: [
+        ".cursor/plans/implementation-plan.md",
+        ".codex/plans/implementation-plan.md",
+        ".claude/plans/implementation-plan.md",
+      ],
+    },
+    {
+      query: ".cursor/plans/implementation",
+      expectedPaths: [".cursor/plans/implementation-plan.md"],
+    },
+  ])(
+    "workspace suggestions find hidden agent plans for '$query'",
+    async ({ query, expectedPaths }) => {
+      const cwd = tmpCwd();
+      try {
+        for (const directory of [".cursor", ".codex", ".claude", ".hidden"]) {
+          mkdirSync(path.join(cwd, directory, "plans"), { recursive: true });
+          writeFileSync(path.join(cwd, directory, "plans", "implementation-plan.md"), "plan\n");
+        }
+
+        const response = await ctx.client.getDirectorySuggestions({
+          cwd,
+          query,
+          limit: 50,
+          includeFiles: true,
+          includeDirectories: true,
+        });
+        expect(response.error).toBeNull();
+        expect(response.entries).toHaveLength(expectedPaths.length);
+        expect(response.entries).toEqual(
+          expect.arrayContaining(
+            expectedPaths.map((entryPath) => ({ path: entryPath, kind: "file" })),
+          ),
+        );
+      } finally {
+        rmSync(cwd, { recursive: true, force: true });
+      }
+    },
+  );
+
   test.each(["..", "..."])("supports file operations on names starting with %s", async (prefix) => {
     const cwd = tmpCwd();
     const fileName = `${prefix}notes.txt`;

packages/server/src/utils/directory-suggestions.ts

@@ -146,6 +146,7 @@ export const WORKSPACE_SEARCH_HIDDEN_DIRECTORIES = [
   ".agents",
   ".claude",
   ".codex",
+  ".cursor",
   ".github",
   ".opencode",
   ".paseo",