chore: remove compile-time SAM3_LOG_LEVEL knob

[PABannier]

What

Removes the compile-time SAM3_LOG_LEVEL define and the SAM3_LOG(level, ...) macro from sam3.cpp.

• SAM3_LOG(1, ...) → plain fprintf(stderr, ...) (per CLAUDE.md style). The 10 #if SAM3_LOG_LEVEL >= 1 guards around the std::chrono timers are gone, so the timers always run.
• The 20 SAM3_LOG(2, ...) calls are deleted. None of them had work that existed only to feed the log: fenc_output_cpu (the fenc_out[0..4] log) is still used by the DETR decoder and the seg head, and every other argument is used elsewhere.
• The define, macro and comment are removed. <chrono> stays because the timers still use it.

Why

The knob defaulted to 1, and no CMake option, CI job or doc ever set it. Level-2 logs were already compiled out of the default build, so stderr output from the default build is the same as before.

Verification

• Parity tool (EdgeTAM f16 + SAM2.1-tiny q8_0, CPU + Metal), stdout byte-compared against origin/main baselines:

  PARITY OK   edgetam_f16 gpu0
  PARITY OK   edgetam_f16 gpu1
  PARITY OK   sam2.1_hiera_tiny_q8_0 gpu0
  PARITY OK   sam2.1_hiera_tiny_q8_0 gpu1
  

• stderr from all 4 runs matches an origin/main build of the same tool once timings are masked. The only other difference is the timing in ggml_metal_library_init: loaded in X sec. These runs print sam3_segment_pvs: graph computed … and completed … (12 each). The sam3_encode_image and sam3_segment_pcs conversions are not reached by these SAM2/EdgeTAM runs; I checked them by reading the code.
• Full Release build: no errors. clang++ -fsyntax-only -Wall -Wextra sam3.cpp gives the same 21 warnings as origin/main (none new, including unused variables). grep -c SAM3_LOG sam3.cpp → 0.

 1 file changed, 7 insertions(+), 83 deletions(-)

Merge note

Other open PRs change lines near these edits: the debug dumps in sam3_segment_pvs, the track/propagate frame functions, and the RAII cleanup of gallocr/ctx frees. Expect small textual conflicts; they need resolving when this merges.

🤖 Generated with Claude Code

https://claude.ai/code/session_01M2qLmQ9ag49hT61V6i9qAq