fix: support multiple keys per action and harden runtime/parsing

tests/sse.test.ts

@@ -22,3 +22,10 @@ test("parseSse joins multi-line data fields with newline", () => {
   assert.equal(messages.length, 1);
   assert.equal(messages[0].data, "line1\nline2");
 });
+
+test("parseSse normalizes CRLF-delimited events", () => {
+  const { messages, rest } = parseSse("data:hello\r\n\r\n");
+  assert.equal(rest, "");
+  assert.equal(messages.length, 1);
+  assert.equal(messages[0].data, "hello");
+});