v0 scaffold: teacher runtime (hermetic pi SDK), data model, ledgers, normalizer

- teacher/system-prompt.md: teach methodology + quiz/ask guidelines folded in
- extensions/: quiz.ts + ask-user-question.ts (hermetic copies)
- src/teacher/create-session.ts: isolated agent (noTools builtin, own agentDir/sessions/prompt)
- src/schema.ts + ledger.ts: append-only ledgers, known-vs-understood data model
- src/extract/normalize.ts: session JSONL -> canonical doc (verified on real session)
- extractor/merger/derive/what-next: specified stubs

tsconfig.json

@@ -0,0 +1,16 @@
+{
+	"compilerOptions": {
+		"target": "ES2022",
+		"module": "NodeNext",
+		"moduleResolution": "NodeNext",
+		"lib": ["ES2022"],
+		"types": ["node"],
+		"strict": true,
+		"noUncheckedIndexedAccess": true,
+		"verbatimModuleSyntax": true,
+		"allowImportingTsExtensions": true,
+		"noEmit": true,
+		"skipLibCheck": true
+	},
+	"include": ["config.ts", "src/**/*.ts"]
+}