[JarryShaw]

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Summary

PortEnumField.post_process peeks at the registry before calling AppType.get. Its Notes said the peek stops get minting a member per ephemeral port, but since #860 get no longer mints. The peek is still needed for a different reason: get's miss member does not pickle, and it dumps as TCP::unknown, not TCP::<unassigned>.

• Fix: the miss branch takes the transport from owner.__transport__, as get does. A str proto ('tcp') or a composite (tcp | udp, a bare int) has no .name, so a miss raised AttributeError.
• Docs: the Notes give the real reason, and EnumField._unregistered_member drops the claim that get mints PORT_54321_tcp. Rebased onto main past docs(corekit): version directives and render fixes (#1103) #1762's edits to the same docstrings.
• Bite: the new tests fail with the peek or the transport fix reverted. Runs: tests/project green.

Closes #1774

[JarryShaw]

Verdict: GOOD TO GO at 61b142439. A Sonnet cross-review (author: Opus) checked 2fd6fcfae, after a prose fix round and a rebase past #1762. This head changes only the subject, from refactor to fix, because the miss-transport change fixes an AttributeError; the tree is identical. The new tests fail with the peek or the transport fix reverted.