[JarryShaw]

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Summary

Stale build leftovers found by the #1103 sweep.

• setup.py: drops the bdist_wheel override, which converted dist_dir/pcapkit after the wheel was written. build_py and install already convert. Fixes the f2format and poseur failure messages.
• Makefile: profile delegates to examples/legacy_smoke. MANIFEST.in: drops prune test (no such directory) and adds recursive-include examples *.md. global-include *.rst now matches nothing shipped and is left for a later pass.
• examples/{benchmark,legacy_smoke}/README.rst move to README.md, carrying docs(repo): correct stale claims and drop timed context in repo files (#1103) #1768's two edits. .gitignore, benchmark.py, the tier test and the documentation conventions page follow.
• Checks: sdist listings differ only by the renames and the new test; wheels match. test_build_leftovers_1773.py fails with each fix reverted. tests/project: 941 passed, 1 skipped.

Closes #1773

[JarryShaw]

Verdict: GOOD TO GO at 3f07b5ef3. A Sonnet cross-review (author: Opus), after a prose fix round and a rebase onto main. #1768's two edits to examples/benchmark/README.rst are carried into the .md. Sdists differ only by the renames and wheels match. The new test fails with each fix reverted. tests/project passed 941.