Re-audit the Modules/imports panel

[tamnd]

Went back over the Modules/imports panel (the 12 flat test files plus the test_import, test_importlib and test_module suites) on the current build to recheck where it actually stands.

I ran each entry the way the gate runs it, one process at a time, and everything comes back clean:

• test_module 39
• test_import 118 (4 skipped)
• test_importlib 1346 (10 skipped)
• test_frozen 3
• test_modulefinder 17
• test_pkg 8
• test_pkgutil 21
• test_pyclbr 6
• test_runpy 40
• test_zipimport 91 (4 skipped)
• test_zipimport_support 4
• test_zipapp 35

No errors, no failures, and the MANIFEST counts already line up, so there was no port change to make here.

The one thing worth flagging: while re-running test_zipimport with several copies going at once in the same directory I'd occasionally see an EOFError come out of zipimport's _get_data. That's the suite reusing a single fixed archive name in the cwd, so two concurrent processes end up truncating each other's file mid-read. CPython behaves the same way in that setup. Sequentially, one process per entry, it passes every time. I left the code alone and wrote the finding into the spec rather than papering over it.

So this PR is just the re-audit note in spec 1731.

[tamnd]

CI's green across the board (linux/macos/windows test matrices, vet, lint, cfg-phase-parity). Nothing in the panel needed touching, so this is just the re-audit note landing.