fix: stop mode filter stripping rule bullets with a colon

filterSkillBodyForMode only filters lines whose label is a real mode (lite/full/ultra). Rule bullets like 'No unrequested abstractions:' and the 'ponytail:' comment convention were being stripped from injected instructions in every mode. Adds regression test.

pi-extension/test/helpers.test.js

@@ -66,3 +66,20 @@ test("filterSkillBodyForMode keeps only requested intensity examples and rows",
   assert.ok(filtered.includes("Ultra example"));
   assert.ok(filtered.includes("Other line"));
 });
+
+test("filterSkillBodyForMode keeps rule bullets that contain a colon", () => {
+  // Regression: rule bullets outside the Intensity section (e.g. the
+  // "No unrequested abstractions:" rule or the `ponytail:` comment convention)
+  // contain a colon and must not be mistaken for mode-example lines.
+  const skillPath = join(import.meta.dirname, "..", "..", "skills", "ponytail", "SKILL.md");
+  const body = readFileSync(skillPath, "utf8");
+
+  const filtered = filterSkillBodyForMode(body, "full");
+
+  assert.ok(filtered.includes("No unrequested abstractions"));
+  assert.ok(filtered.includes("Mark deliberate simplifications"));
+  // The Intensity examples are still filtered down to the active mode.
+  assert.ok(filtered.includes('full: "`@lru_cache'));
+  assert.ok(!filtered.includes('lite: "Done'));
+  assert.ok(!filtered.includes('ultra: "No cache'));
+});