Phase 14: split kept-window filter from registry gate — defer planning stage

filterSkillsNeedingReinjectByKept tracks absent skills without registeredNames; immediate path keeps the combined filter.

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

src/kept.ts

@@ -56,17 +56,27 @@ export function skillsPresentInKeptWindow(
 	return present;
 }
 
+/** Tracked skills absent from kept window — defer planning stage without registry filter (Phase 14 / B-002). */
+export function filterSkillsNeedingReinjectByKept(
+	tracked: readonly TrackedSkill[],
+	keptPresent: ReadonlySet<string>,
+): string[] {
+	const needing: string[] = [];
+	for (const skill of tracked) {
+		if (!keptPresent.has(skill.name)) {
+			needing.push(skill.name);
+		}
+	}
+	return needing;
+}
+
 /** Tracked skills missing from kept window but still registered (SPEC §5.2, §6.4). */
 export function filterSkillsNeedingReinject(
 	tracked: readonly TrackedSkill[],
 	keptPresent: ReadonlySet<string>,
 	registeredNames: ReadonlySet<string>,
 ): string[] {
-	const needing: string[] = [];
-	for (const skill of tracked) {
-		if (registeredNames.has(skill.name) && !keptPresent.has(skill.name)) {
-			needing.push(skill.name);
-		}
-	}
-	return needing;
+	return filterSkillsNeedingReinjectByKept(tracked, keptPresent).filter((name) =>
+		registeredNames.has(name),
+	);
 }