Phase 10: rescan branch for tracked skills when state entry missing — SPEC §6.3.

Walk user messages and read tool calls on session_start to rebuild tracked
skills from history when no skill-reinject:state entry exists on the branch.

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

src/index.ts

@@ -22,6 +22,7 @@ import {
 	tryConsumeDeferredReinject,
 } from "./reinject.js";
 import { readSettings } from "./settings.js";
+import { rescanSkillsFromBranch } from "./rescan.js";
 import { findRegisteredSkillByName, resolveRegisteredSkills } from "./skills-registry.js";
 import {
 	applyExtensionState,
@@ -99,9 +100,13 @@ export default function skillReinject(pi: ExtensionAPI): void {
 
 	pi.on("session_start", async (_event, ctx) => {
 		detectAndCachePiAutoCompact(pi, runtime);
-		readSettings(ctx);
-		const loaded = loadStateFromBranch(ctx.sessionManager.getBranch());
+		const settings = readSettings(ctx);
+		const branch = ctx.sessionManager.getBranch();
+		const loaded = loadStateFromBranch(branch);
 		applyExtensionState(state, loaded ?? createInitialState());
+		if (!loaded) {
+			rescanSkillsFromBranch(state, branch, ctx.cwd, registeredSkills, settings.trackReadPaths);
+		}
 	});
 
 	pi.on("session_before_compact", async () => {