examples: fix -Wimplicit-int-float-conversion in frameCompress.c and bench_functions.c on macOS CI

Background & Failure Context

In the GitHub Actions Cross Platform workflow (.github/workflows/cross-platform.yml), the macOS job builds and runs comprehensive tests under strict compilation flags:

CFLAGS="-O3 -Werror -Wconversion -Wno-sign-conversion" make -j test V=1

Under modern Clang / Apple Clang (LLVM 15+), compiling the examples directory triggers fatal -Wimplicit-int-float-conversion errors in examples/frameCompress.c and examples/bench_functions.c:

CC cachedObjs/.../frameCompress.o
frameCompress.c:446:40: error: implicit conversion from 'const unsigned long long' to 'double' may lose precision [-Werror,-Wimplicit-int-float-conversion]
  446 |             (double)ret.size_out / ret.size_in * 100);
      |                                  ~ ~~~~^~~~~~~
1 error generated.

CC cachedObjs/.../bench_functions.o
bench_functions.c:356:255: error: implicit conversion from 'uint64_t' (aka 'unsigned long long') to 'double' may lose precision [-Werror,-Wimplicit-int-float-conversion]
  356 | ... (double)time_taken__default * 100 / time_taken__default);
      |                                       ~ ^~~~~~~~~~~~~~~~~~~
(and 9 other identical warnings in bench_functions.c)

Root Cause Analysis

In both examples/frameCompress.c (line 446) and examples/bench_functions.c (lines 356-368), 64-bit unsigned integers (ret.size_in and time_taken_*) are used as divisors in floating-point operations. Because IEEE 754 double has 53 bits of mantissa, Clang raises -Wimplicit-int-float-conversion under -Wconversion -Werror to protect against potential precision loss.

Steps to Reproduce

Run on macOS (or any system with modern Clang):

make -C examples clean
CFLAGS="-O3 -Werror -Wconversion -Wno-sign-conversion" make -C examples test

Proposed Fix

Explicitly cast 64-bit integer divisors to (double) in examples/frameCompress.c and examples/bench_functions.c:

• examples/frameCompress.c: (double)ret.size_out / (double)ret.size_in * 100
• examples/bench_functions.c: (double)time_taken * 100.0 / (double)time_taken_default

Real Physical Verification

Tested and verified on macOS with Apple Clang:

• make -C examples clean && CFLAGS="-O3 -Werror -Wconversion -Wno-sign-conversion" make -C examples test (100% Passed, exit code 0).
• CFLAGS="-O3 -Werror -Wconversion -Wno-sign-conversion" make test (100% Passed across all suites, exit code 0).

I'd be glad to submit a quick PR with this fix if you'd like!