fix(cursor): omit undefined exec args and keep exec-resolved under owned dialects

Cursor bash/grep frames wrote optional kwargs as present-undefined, and
tools.format gemini projectors dropped kCursorExecResolved so settled
calls ran twice.

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/coding-agent/test/cursor-exec.test.ts

@@ -1537,9 +1537,9 @@ describe("CursorExecHandlers Pi frame translation", () => {
 
 		expect(calls).toEqual([
 			{ pattern: "x", path: ".", case: false },
-			// Case-sensitive is the local default, so `false` maps to "unset",
-			// not to `case: true`.
-			{ pattern: "x", path: ".", case: undefined },
+			// Case-sensitive is the local default, so `false` maps to unset —
+			// the key is omitted rather than written as `case: undefined`.
+			{ pattern: "x", path: "." },
 		]);
 	});