MUSCLE (U): Fix verify_pass1.py crash (a: prefix parsing), CDL reclass overrides

Urban Champion (JU): Pass 1 complete (CDL verified), Pass 2 complete
  - 519 labels renamed to semantic names via pass2.py apply
  - 10 zero-page semantic aliases added to locals.inc
  - Branch table at CB70-CBAC restructured per CDL (CB70-CB90=data, CB91-CBAC=code)
  - E07F-E09D region fixed (misaligned decode at E08D)
  - BYTE-IDENTICAL at PRG level verified

Tools:
  - cdl_reclass.py: overrides now win over CDL conflicts
  - nesdis.py: fixed a: prefix parsing for JSR/JMP operands; IND mode emits no a: prefix
  - verify_pass1.py: all 17 top-level projects pass, no crashes

_tools/cdl_reclass.py

@@ -260,7 +260,8 @@ def main():
             if not (body[i] & 3) or tgt[i] == k:
                 tgt[i] = k
             else:
-                conflicts.append(f'${BASE+i:04X}: CDL says {tgt[i]}, override says {k}')
+                conflicts.append(f'${BASE+i:04X}: CDL says {tgt[i]}, override says {k} (override wins)')
+                tgt[i] = k  # override always wins when explicitly specified
 
     # ---- region derivation ----
     def merge(iv):