[JarryShaw]

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Summary

#1103 round 2: the files phase 1 left unread, plus the phase-1 reviewers' follow-ups.

Correct tests/protocols prose that no longer matches the code. Prose
only: the AST guard finds all seven files identical.

• test_layer_placement_unit: Link sets ten names of its own, not
  seven, and OSPF loses four of them, _shipped_proto included.
• test_protocol_code_registration_unit: Engine's registry keyword
  is engine=, renamed from name= by fix(foundation): rename Engine's registry keyword to engine, which works on Python 3.10 (#514) #557.
• test_http_unit: Command.get's case rule is RFC 959 section 5.3,
  not 4.1; TCP ports 80 and 8080 bind the version dispatcher, not
  httpv1.HTTP, so the "straight to this class" claim is dropped.
• test_hip_unit: all three two_octet_prefix_list_len call sites
  take two-octet items, so none is a one-octet contrast.
• test_ipv4_unit: the ProtocolBase descendant count is stated as a
  lower bound, and a test_schema_unit.py line is re-measured.
• test_dispatch_reachability_unit: drop the stale count of 38
  __proto__ entries; the registry test pins the number.
• test_hip_locator_set_length_unit: rewrap an over-long line.

Refs #1103

[JarryShaw]

Verdict: GOOD TO GO at 89b56354c. Sonnet review and re-check (author: Opus). The first review passed. A fix round corrected the one-octet claim at test_hip_unit.py:2001 against schema/internet/hip.py. The AST guard is identical against the base, tests/project passes, and every added directive says 1.5.0.