Docs: reference example test files in README and clarify benchmark example docstring

[Code0x58]

Motivation

• Improve documentation discoverability by pointing to concrete example tests for measurement, equivalence, and benchmarking instead of a TODO placeholder.

Description

• Replace the README TODO with a pointer to examples/test_measure.py, examples/test_equivalence.py, and examples/test_benchmark.py, and update the benchmark example docstring in examples/test_benchmark.py to clarify it uses the pytest-benchmark fixture.

Testing

• Ran the benchmark example with pytest examples/test_benchmark.py -q and it completed successfully.

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Codex Task

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (2b32a61) to head (e49714f).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##            master        #7   +/-   ##
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  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          189       189           
=========================================
  Hits           189       189           

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