feat(tui): find bundled entry.js from wheel before falling back to npm build

Add _find_bundled_tui() that checks for hermes_cli/tui_dist/entry.js
(present in wheel installs) and wire it into _make_tui_argv() between
the HERMES_TUI_DIR prebuilt path and the npm install fallback.

hermes_cli/main.py

@@ -1024,6 +1024,14 @@ def _ensure_tui_node() -> None:
     os.environ["PATH"] = os.pathsep.join(parts)
 
 
+def _find_bundled_tui(hermes_cli_dir: Path | None = None) -> Path | None:
+    """Find a pre-built TUI entry.js bundled in the wheel."""
+    if hermes_cli_dir is None:
+        hermes_cli_dir = Path(__file__).parent
+    bundled = hermes_cli_dir / "tui_dist" / "entry.js"
+    return bundled if bundled.is_file() else None
+
+
 def _make_tui_argv(tui_dir: Path, tui_dev: bool) -> tuple[list[str], Path]:
     """TUI: --dev → tsx src; else node dist (HERMES_TUI_DIR prebuilt or esbuild)."""
     _ensure_tui_node()
@@ -1058,6 +1066,12 @@ def _make_tui_argv(tui_dir: Path, tui_dev: bool) -> tuple[list[str], Path]:
                 node = _node_bin("node")
                 return [node, str(p / "dist" / "entry.js")], p
 
+        # 1b. Bundled in wheel (pip install)
+        bundled = _find_bundled_tui()
+        if bundled is not None:
+            node = _node_bin("node")
+            return [node, str(bundled)], bundled.parent
+
     # 2. Normal flow: npm install if needed, always esbuild, then node dist/entry.js.
     #    --dev flow: npm install if needed, then tsx src/entry.tsx (no build).
     if _tui_need_npm_install(tui_dir):

tests/hermes_cli/test_tui_bundled.py

@@ -0,0 +1,21 @@
+from pathlib import Path
+
+
+def test_tui_finds_bundled_entry_js(tmp_path):
+    """_find_bundled_tui finds entry.js bundled in the package."""
+    tui_dist = tmp_path / "hermes_cli" / "tui_dist"
+    tui_dist.mkdir(parents=True)
+    entry = tui_dist / "entry.js"
+    entry.write_text("// bundled TUI", encoding="utf-8")
+
+    from hermes_cli.main import _find_bundled_tui
+    result = _find_bundled_tui(hermes_cli_dir=tmp_path / "hermes_cli")
+    assert result is not None
+    assert result.name == "entry.js"
+
+
+def test_tui_returns_none_when_no_bundle(tmp_path):
+    """_find_bundled_tui returns None when no bundle exists."""
+    from hermes_cli.main import _find_bundled_tui
+    result = _find_bundled_tui(hermes_cli_dir=tmp_path / "hermes_cli")
+    assert result is None