feat(python-scope): 3-var flat destructuring for enumerate(d.items())

Adds the \`for i, k, v in enumerate(d.items())\` shape — flat
3-variable destructuring of the (i, (k, v)) tuple yielded by
\`enumerate\` over \`items()\`. Binds v (the last identifier in the
pattern_list) to the dict identifier; the existing dict-aware
stripGeneric unwraps to the value type.

Verification:
- Flag-off: 191/191 (identical baseline).
- Flag-on: 4 fail / 187 pass (was 5/186; +1).
- tsc --noEmit clean.

gitnexus/src/core/ingestion/languages/python/query.ts

@@ -185,6 +185,24 @@ export const PYTHON_SCOPE_QUERY = `
   (#eq? @_enum "enumerate")
   (#eq? @_items "items")) @type-binding.alias
 
+;; for i, k, v in enumerate(d.items()) — 3-var flat destructuring of
+;; the (i, (k,v)) tuple emitted by enumerate over items(). Bind v
+;; (last id) to d.
+(for_statement
+  left: (pattern_list
+    (identifier)
+    (identifier)
+    (identifier) @type-binding.name)
+  right: (call
+    function: (identifier) @_enum
+    arguments: (argument_list
+      (call
+        function: (attribute
+          object: (identifier) @type-binding.type
+          attribute: (identifier) @_items))))
+  (#eq? @_enum "enumerate")
+  (#eq? @_items "items")) @type-binding.alias
+
 ;; for v in d.values() — bind v to d (dict-strip yields value type).
 (for_statement
   left: (identifier) @type-binding.name

gitnexus/src/core/ingestion/languages/python/scopes.scm

@@ -197,6 +197,22 @@
   (#eq? @_enum "enumerate")
   (#eq? @_items "items")) @type-binding.alias
 
+; for i, k, v in enumerate(d.items()) — 3-var flat destructuring.
+(for_statement
+  left: (pattern_list
+    (identifier)
+    (identifier)
+    (identifier) @type-binding.name)
+  right: (call
+    function: (identifier) @_enum
+    arguments: (argument_list
+      (call
+        function: (attribute
+          object: (identifier) @type-binding.type
+          attribute: (identifier) @_items))))
+  (#eq? @_enum "enumerate")
+  (#eq? @_items "items")) @type-binding.alias
+
 ; for v in d.values() — bind v to d (dict-strip yields value type).
 (for_statement
   left: (identifier) @type-binding.name