Added sanity check baseline made by claude.

Also changed the location to a panel in VIEW_3D instead of menu.

core/contexts.py

@@ -0,0 +1,44 @@
+"""Production contexts a file can be checked against.
+
+To add a context, append a ``Context`` to ``CONTEXTS`` and list its id in the
+``contexts`` attribute of the checks that apply to it.
+"""
+
+from dataclasses import dataclass
+
+GENERAL = "GENERAL"
+CHAR_MOD = "CHAR_MOD"
+CHAR_LINEART = "CHAR_LINEART"
+LAYOUT = "LAYOUT"
+
+# Every asset context gets the general asset checks.
+ASSET = frozenset({GENERAL, CHAR_MOD, CHAR_LINEART})
+CHARACTER = frozenset({CHAR_MOD, CHAR_LINEART})
+ALL = frozenset({GENERAL, CHAR_MOD, CHAR_LINEART, LAYOUT})
+
+
+@dataclass(frozen=True)
+class Context:
+    id: str
+    label: str
+    description: str
+    icon: str = "NONE"
+
+
+CONTEXTS = [
+    Context(GENERAL, "Asset: General", "Props, sets and generic assets (modeling and lineart)", "MESH_CUBE"),
+    Context(CHAR_MOD, "Character: Modeling", "Character modeling file", "USER"),
+    Context(CHAR_LINEART, "Character: Lineart / Shading", "Character lineart and shading file", "OUTLINER_OB_GREASEPENCIL"),
+    Context(LAYOUT, "Shot: Layout", "Shot layout file", "SEQUENCE"),
+]
+
+
+def get_context(context_id):
+    for context in CONTEXTS:
+        if context.id == context_id:
+            return context
+    return None
+
+
+def enum_items():
+    return [(c.id, c.label, c.description, c.icon, i) for i, c in enumerate(CONTEXTS)]