feat: eval/exec of strings, gallery Replay, callable actions; iNSight and SomethingBetter now pass

- pyparse.ts: parser for expressions and simple statements built at run time, producing
  the sandbox's own IR; backs eval() and exec() (e.g. exec("persistent." + var + " = 0"))
- Replay/EndReplay and renpy.end_replay: the engine stashes the full game state, runs the
  label with the given scope and restores everything when it ends; locked replays are
  insensitive. Save loading shared as applySave()
- Screen actions are callable (MainMenu(confirm=False)())
- jump main_menu_screen is Ren'Py's own label: it opens the player's main menu
- Screens: a closing quote ends the word before a letter ("text"size 15) but not before
  an operator ("a"+b); Text(...) pictures in image blocks
- README: current capabilities and limits of the Ren'Py support

Strict compatibility check on the local collection: Tomie, Twisted-Thoughts, Hooked,
iNSight-of-you and SomethingBetter pass; TheFixer (custom AlphaMask wardrobe, missing
labels) and That_New_Teacher (custom statements, Render API) do not.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

frontend/tests/renpy-runtime.test.mjs

@@ -9,12 +9,12 @@ Object.assign(globalThis, { window, document });
 globalThis.requestAnimationFrame = (cb) => setTimeout(() => cb(performance.now()), 4);
 
 const compiled = await build({
-  stdin: { contents: `export * from "./python"; export * from "./atl"; export * from "./colormatrix"; export * from "./pymodules";`,
+  stdin: { contents: `export * from "./python"; export * from "./atl"; export * from "./colormatrix"; export * from "./pymodules"; export * from "./pyparse";`,
            resolveDir: fileURLToPath(new URL("../src/player/", import.meta.url)), loader: "ts" },
   bundle: true, write: false, format: "esm", platform: "node", logLevel: "silent",
 });
 const m = await import(`data:text/javascript;base64,${Buffer.from(compiled.outputFiles[0].text).toString("base64")}`);
-const { Python, AtlRunner, ColorMatrix, colorMatrices, legacyMatrices, matrixFilter, pythonModules, PyDict } = m;
+const { parseExpression, parseStatements, Python, AtlRunner, ColorMatrix, colorMatrices, legacyMatrices, matrixFilter, pythonModules, PyDict } = m;
 const wait = (ms) => new Promise((r) => setTimeout(r, ms));
 const name = (id) => ({ k: "name", id });
 const attr = (o, a) => ({ k: "attr", o, a });
@@ -130,3 +130,23 @@ test("on hover handlers run when the button reports the event", async () => {
   await wait(20);
   assert.equal(props.alpha, 1);
 });
+
+test("eval/exec of source built at run time use the sandbox's own rules", () => {
+  const { py, store } = python();
+  store.score = 7;
+  store.persistent = new PyDict();
+  const evaluate = (source) => py.eval(parseExpression(source));
+  assert.equal(evaluate("score * 2 + 1"), 15);
+  assert.equal(evaluate("'a' + 'b' if score > 5 else 'c'"), "ab");
+  assert.equal(evaluate("not (score < 3) and score in [7, 8]"), true);
+  assert.deepEqual(evaluate("[1, 2, (3, 4)][2]"), [3, 4]);
+  assert.equal(evaluate("score < 10 < 20"), true);
+  py.exec(parseStatements("score += 3; other = score ** 2\npersistent.seen = 1"));
+  assert.equal(store.score, 10);
+  assert.equal(store.other, 100);
+  assert.equal(store.persistent.get("seen"), 1);
+  assert.throws(() => parseExpression("score +"), /Синтаксическая ошибка/);
+  assert.throws(() => parseExpression("lambda: 1"), /не поддерживается/);
+  assert.throws(() => parseStatements("import os"), /не поддерживается/);
+  assert.equal(py.eval(parseExpression("__import__")), null, "dunder names stay unreachable");
+});