Phase 3: add parseSkillBlocksFromText — skill-block scan per SPEC §6.2.

Mirror agent-session parseSkillBlock regex for detecting expanded skill blocks in user messages.

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

src/detect.ts

@@ -1,8 +1,31 @@
 /** Raw `/skill:name` at start of user input (SPEC §6.2 #1). */
 const SLASH_SKILL_RE = /^\/skill:([a-z0-9-]+)/;
 
+/** mirror agent-session `parseSkillBlock` — global scan (SPEC §6.2 #2). */
+const SKILL_BLOCK_RE =
+	/<skill name="([^"]+)" location="([^"]+)">\n([\s\S]*?)\n<\/skill>/g;
+
+export interface ParsedSkillBlock {
+	name: string;
+	location: string;
+	content: string;
+}
+
 /** Returns skill name when text is a slash skill command, else null. */
 export function detectSlashSkill(text: string): string | null {
 	const match = SLASH_SKILL_RE.exec(text);
 	return match?.[1] ?? null;
 }
+
+/** All skill blocks in message text (empty when none). */
+export function parseSkillBlocksFromText(text: string): ParsedSkillBlock[] {
+	const blocks: ParsedSkillBlock[] = [];
+	for (const match of text.matchAll(SKILL_BLOCK_RE)) {
+		blocks.push({
+			name: match[1],
+			location: match[2],
+			content: match[3],
+		});
+	}
+	return blocks;
+}