fix(codegen): eliminate dead optimizer L3 arena allocation (#25)

The arena-elimination regex in _patch_shared_buffers only matched
pi_*_malloc (L2) but not cl_ram_malloc (L3).  When all optimizer I/O
buffers are shared with the training network, the L3 arena has no
remaining pointer-arithmetic references and should be removed — but
the regex silently failed to match the cl_ram_malloc call, leaving a
dead allocation that wastes external RAM.

Extend the pattern to match both pi_*_malloc and cl_ram_malloc so the
dead-code check works uniformly across all memory levels.

Co-authored-by: Run Wang <runwang@skylab.ee.ethz.ch>
Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: 3 people

DeeployTest/testUtils/codeGenerateTraining.py

@@ -583,7 +583,8 @@ def _replace(m: re.Match) -> str:
     for level in ('L2', 'L3'):
         arena_sym = f'DeeployOptNetwork_MEMORYARENA_{level}'
         # Pattern for the malloc assignment line itself
-        malloc_line_pat = re.compile(rf'[^\n]*{re.escape(arena_sym)}\s*=\s*\([^)]+\)\s*pi_\w+_malloc\([^;]+\);\s*\n')
+        malloc_line_pat = re.compile(
+            rf'[^\n]*{re.escape(arena_sym)}\s*=\s*\([^)]+\)\s*(?:pi_\w+_malloc|cl_ram_malloc)\([^;]+\);\s*\n')
         # Pattern for any use of the arena in pointer arithmetic:
         #   (char *)ARENA + OFFSET  or  (void *)ARENA  etc.
         arena_use_pat = re.compile(rf'\(\s*(?:char|void|int8_t)\s*\*\s*\)\s*{re.escape(arena_sym)}')