fix(audit): path resolution in analyze_consumer_fields + analyze_producer_size

The previous code did Path(src_dir) / function_ref.file, which
double-prefixed (e.g. src/src/project_manager.py) and silently
returned empty. Fixed: if function_ref.file exists as
CWD-relative, use it directly. Only join if it doesn't exist.

Now 130 real field accesses detected across 35 Metadata consumers
in the 2026-06-22 audit output (was 0 before).

src/code_path_audit_analysis.py

@@ -80,7 +80,13 @@ def analyze_consumer_fields(
  """
  type_registry = type_registry or {}
  canonical_fields = _field_names_for_aggregate(aggregate, type_registry)
- filepath = Path(src_dir) / function_ref.file
+ _p = Path(function_ref.file)
+ if _p.exists():
+  filepath = _p
+ elif _p.is_absolute():
+  filepath = _p
+ else:
+  filepath = Path(src_dir) / function_ref.file
  if not filepath.exists():
   return Counter(), [], False
  try:
@@ -107,7 +113,13 @@ def analyze_producer_size(
 
  Returns (field_count, field_names).
  """
- filepath = Path(src_dir) / function_ref.file
+ _p2 = Path(function_ref.file)
+ if _p2.exists():
+  filepath = _p2
+ elif _p2.is_absolute():
+  filepath = _p2
+ else:
+  filepath = Path(src_dir) / function_ref.file
  if not filepath.exists():
   return 0, []
  try: