feat: build profile for The Lewdest House; panoramas as GPU hints, live2d-only init branches, drag/at syntax

The build (fingerprint of its scripts) skips third-party code written against Ren'Py's render API
(colour picker demo, Kinetic Text Tags, cps_preview) and waives its one missing test screen. Converter:
xpan/ypan/matrixtransform/matrixanchor are skipped like other GPU hints, `if renpy.has_live2d()` in an
init block keeps only its else branch, `crop(...)xpos` and `crop (1, 2, 3, 4)` parse, `drag` is a screen
container, `at icon["at"]` becomes a dynamic entry, and the whitelist gains Matrix, Move, absolute and
the no-op helpers. The game now passes the strict check and converts fully (3272 files, 288 MB).

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

backend/tests/test_screens.py

@@ -235,3 +235,14 @@ def test_atl_pause_with_brackets():
     steps = data.atl["t"]["steps"] if "t" in data.atl else data.transforms["t"]
     assert not data.blockers
     assert [(s["op"], s["t"]) for s in steps] == [("move", 1.0), ("pause", 1.5), ("move", 1.0)]
+
+
+def test_dynamic_at_value_and_draggable_box():
+    data = parse('transform spin:\n    rotate 5\nscreen s(icon):\n    imagebutton:\n        idle "a" at icon["at"]\n'
+                 '    drag:\n        drag_name "box"\n        draggable True\n        text "x"\n'
+                 'label start:\n    call screen s({"at": spin})\n')
+    audit_ir(data)
+    require_supported_scripts(data)
+    body = data.screens["s"]["body"]
+    assert body[0]["props"]["at"][0]["dyn"]["k"] == "sub"
+    assert body[1]["w"] == "drag" and "draggable" in body[1]["props"]