fix(parser): use correct grammar in Params validation errors

Replace "values lesser than -1" with "values less than -1" in
addParam and addSubParam throw messages. "Lesser" is not standard
English for numeric comparisons; tests assert the exact message.

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

src/common/parser/Params.test.ts

@@ -199,13 +199,13 @@ describe('Params', () => {
     it('reject params lesser -1', () => {
       const params = new Params();
       params.addParam(-1);
-      assert.throws(() => params.addParam(-2), 'values lesser than -1 are not allowed');
+      assert.throws(() => params.addParam(-2), 'values less than -1 are not allowed');
     });
     it('reject subparams lesser -1', () => {
       const params = new Params();
       params.addParam(-1);
       params.addSubParam(-1);
-      assert.throws(() => params.addSubParam(-2), 'values lesser than -1 are not allowed');
+      assert.throws(() => params.addSubParam(-2), 'values less than -1 are not allowed');
       assert.deepEqual(params.toArray(), [-1, [-1]]);
     });
     it('clamp parsed params', () => {