chore: remove EdgeTAM encoder profiler

[PABannier]

sam3_profile_edgetam_encode is 437 lines in sam3.cpp plus a public declaration, a 96-line example, a CMake target and a release-packaging entry. Its one caller is examples/profile_edgetam.cpp. It rebuilds the RepViT stem, stages and FPN neck as separate sub-graphs only to print per-stage timings. sam3_benchmark --filter edgetam already reports load / encode / per-frame latency for every backend, and a one-off stage breakdown can be redone from git history.

Removed:

• sam3_profile_edgetam_encode and its private helpers (sam3_profile_*) in sam3.cpp
• the "Profiling" section in sam3.h
• examples/profile_edgetam.cpp and its target in examples/CMakeLists.txt
• sam3_profile_edgetam from the binaries packaged by .github/workflows/release.yml (macOS/Linux and Windows)

Stacked on #20 because both PRs delete adjacent sections of sam3.h. Merge #20 first; GitHub will retarget this PR to main.

Verification: a parity tool runs encode, PVS point + box, and a 3-frame visual track, then compares the output byte for byte with origin/main:

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

The full Release build (library + all examples) has no errors, and git grep profile_edgetam is empty.

git diff --shortstat: 5 files changed, 2 insertions(+), 561 deletions(-).

Part of an over-engineering cleanup series.

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https://claude.ai/code/session_01M2qLmQ9ag49hT61V6i9qAq