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-# CHECK_RETURN Implementation Complete
-
-## Summary
-
-Implemented Option D (Hybrid) for non-fatal error handling with early return.
-
-## What Was Created
-
-### 1. Header File: `src/util/check_return.h`
-
-**Macros provided:**
-```cpp
-// Simple error check (90% of cases)
-CHECK_RETURN_IF(condition, return_value, "Error: %s", msg);
-
-// Complex error check with cleanup (10% of cases)
-CHECK_RETURN_BEGIN(condition, return_value)
-  // cleanup code
-  ERROR_MSG("Error: %s", msg);
-CHECK_RETURN_END
-
-// Warning messages (non-fatal)
-WARN_IF(condition, "Warning: %s", msg);
-```
-
-**Build behavior:**
-- **Debug/Normal:** Full error messages with file:line info
-- **STRIP_ALL:** Messages stripped, control flow preserved (saves ~1-2KB)
-
-## What Was Applied
-
-### 2. src/util/asset_manager.cc (3 call sites)
-
-**Before:**
-```cpp
-if (proc_gen_func_ptr == nullptr) {
-  fprintf(stderr, "Error: Unknown procedural function at runtime: %s\n",
-          source_record.proc_func_name_str);
-  if (out_size) *out_size = 0;
-  return nullptr;
-}
-```
-
-**After:**
-```cpp
-CHECK_RETURN_BEGIN(proc_gen_func_ptr == nullptr, nullptr)
-  if (out_size) *out_size = 0;
-  ERROR_MSG("Unknown procedural function at runtime: %s",
-            source_record.proc_func_name_str);
-  return nullptr;
-CHECK_RETURN_END
-```
-
-**Applied to:**
-- Unknown procedural function check
-- Memory allocation failure
-- Procedural generation failure
-
-### 3. src/test_demo.cc (2 call sites)
-
-**Before:**
-```cpp
-if (i + 1 >= argc) {
-  fprintf(stderr, "Error: --log-peaks requires a filename argument\n\n");
-  print_usage(argv[0]);
-  return 1;
-}
-```
-
-**After:**
-```cpp
-CHECK_RETURN_BEGIN(i + 1 >= argc, 1)
-  print_usage(argv[0]);
-  ERROR_MSG("--log-peaks requires a filename argument\n");
-  return 1;
-CHECK_RETURN_END
-```
-
-**Applied to:**
-- Missing --log-peaks argument
-- Unknown command-line option
-
-## Testing
-
-✅ **All 31 tests pass**
-```
-100% tests passed, 0 tests failed out of 31
-Total Test time (real) =   0.64 sec
-```
-
-✅ **Error messages work correctly:**
-```bash
-$ ./test_demo --invalid-option
-Error: Unknown option '--invalid-option'
- [test_demo.cc:199]
-Usage: ./test_demo [OPTIONS]
-...
-```
-
-## Comparison: FATAL_XXX vs CHECK_RETURN
-
-| Aspect | FATAL_XXX | CHECK_RETURN |
-|--------|-----------|--------------|
-| **Outcome** | `abort()` - program terminates | `return value` - caller handles |
-| **Use Case** | Programming errors, invariants | Recoverable errors, validation |
-| **Example** | Bounds checks, null dereference | Invalid input, missing files |
-| **STRIP_ALL** | Keep checks, strip messages | Strip messages, keep checks |
-| **FINAL_STRIP** | Strip everything (0 bytes) | Keep checks (preserves logic) |
-
-## Files Modified
-
-**Created:**
-- `src/util/check_return.h` (180 lines)
-
-**Modified:**
-- `src/util/asset_manager.cc` (+1 include, 3 call sites refactored)
-- `src/test_demo.cc` (+1 include, 2 call sites refactored)
-
-## Size Impact
-
-**Estimated savings with STRIP_ALL:**
-- 5 call sites × ~100 bytes per message string = ~500 bytes saved
-- Control flow preserved (if-return statements kept)
-- No functional changes
-
-## Remaining Opportunities
-
-Can be applied to (optional):
-- `src/gpu/texture_manager.cc` - 1 call site
-- `src/audio/backend/wav_dump_backend.cc` - 1 call site
-- Test files - several call sites
-
-**Total potential:** ~10-15 call sites across codebase
-
-## Usage Guidelines
-
-### When to use CHECK_RETURN_IF:
-✅ Simple validation with no cleanup
-```cpp
-CHECK_RETURN_IF(ptr == nullptr, false, "Invalid pointer");
-CHECK_RETURN_IF(size > MAX, -1, "Size too large: %d", size);
-```
-
-### When to use CHECK_RETURN_BEGIN/END:
-✅ Validation that needs cleanup before return
-```cpp
-CHECK_RETURN_BEGIN(allocation_failed, nullptr)
-  delete[] buffer;
-  if (out_size) *out_size = 0;
-  ERROR_MSG("Allocation failed: %d bytes", size);
-  return nullptr;
-CHECK_RETURN_END
-```
-
-### When to use WARN_IF:
-✅ Non-critical issues that don't prevent execution
-```cpp
-WARN_IF(config_missing, "Config not found, using defaults");
-```
-
-### When to use FATAL_XXX instead:
-❌ Don't use CHECK_RETURN for:
-- Programming errors (use FATAL_ASSERT)
-- Array bounds violations (use FATAL_CHECK)
-- Impossible code paths (use FATAL_UNREACHABLE)
-- Corrupted state (use FATAL_ERROR)
-
-## Next Steps (Optional)
-
-1. Apply to remaining files (texture_manager.cc, wav_dump_backend.cc)
-2. Update CONTRIBUTING.md with CHECK_RETURN guidelines
-3. Update AI_RULES.md if needed
-4. Consider FINAL_STRIP policy (strip checks vs keep checks)
-
-## Documentation
-
-Full documentation in header file:
-- Usage examples
-- Build mode behavior
-- Comparison with FATAL_XXX
-- Size impact analysis