@@ -137,23 +137,6 @@ RFC ground in the ``#:`` comment beside it. The test walks
 ``IPv6_Ext.__subclasses__()`` rather than a hard-coded list, so any further header is
 held to the convention whether or not anyone remembers this page.
 
-The Retired ``IPv6_GenericExt`` Name
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-The class arrived as ``IPv6_GenericExt``, a fallback parser for an unrecognised
-extension header (:issue:`891`), and
-:issue:`917` merged that role with
-the shared-base role into one class under the shorter name. No compatibility alias
-was left behind, and that was deliberate. The owner ruled that the
-``IPv6_GenericExt`` name goes for good: it was an intermediate state, and it was never
-released.
-
-What makes that safe rather than merely decided: ``IPv6_GenericExt`` existed on
-``main`` from ``b3551cb63`` to ``93cf940b3``, under four hours on one day, and no release tag falls
-between the two commits -- ``git tag --contains`` names the same tags for both -- so it
-appears in **no** release and the break has no callers to inconvenience. Do not
-reintroduce it as an alias, and do not cite it as a former public name.
-
 ESP's Two Facts
 ~~~~~~~~~~~~~~~
 
 
@@ -106,12 +106,11 @@ class TestCanSeekIsPublic(unittest.TestCase):
     def setUp(self) -> None:
         reimport_once_per_class(self)
 
-    def test_can_seek_is_exported_and_the_private_name_is_gone(self) -> None:
-        """No alias keeps the old private name importable."""
+    def test_can_seek_is_exported(self) -> None:
+        """``can_seek`` is listed in the module's ``__all__``."""
         from pcapkit.corekit import io as corekit_io  # pylint: disable=import-outside-toplevel
 
         self.assertIn('can_seek', corekit_io.__all__)
-        self.assertFalse(hasattr(corekit_io, '_can_seek'))
 
     def test_can_seek_tells_a_lying_pipe_from_a_seekable_stream(self) -> None:
         """A pipe claiming to seek does not; a stream without a descriptor is trusted."""
 
@@ -4,10 +4,10 @@
 :class:`~pcapkit.corekit.io.PeekableStream` gives a seekable stream without
 ``peek`` one, for :class:`~pcapkit.foundation.extraction.Extractor` (#1506,
 #1509). :class:`~pcapkit.corekit.io.NamedStream` gives a stream the ``name``
-:func:`pcapfile.savefile.load_savefile` reads, for the PyPCAPFile engine. Both
-live beside :class:`~pcapkit.corekit.io.SeekableReader` (formerly the
-file-local ``_PeekableStream`` in :mod:`pcapkit.foundation.extraction` and
-``_NamedStream`` in :mod:`pcapkit.foundation.engines.pypcapfile`).
+:func:`pcapfile.savefile.load_savefile` reads, for the PyPCAPFile engine
+(formerly the file-local ``_NamedStream`` in
+:mod:`pcapkit.foundation.engines.pypcapfile`). Both live beside
+:class:`~pcapkit.corekit.io.SeekableReader`.
 
 Every class is imported from :mod:`pcapkit.corekit.io` inside each test, after
 :func:`~tests._support.reimport_once_per_class`.
 
@@ -3,8 +3,8 @@
 
 The *House Conventions* pages, under :file:`docs/source/contributing/conventions/`,
 record the settled design rulings, and most of what they record is reasoning --
-which no test can check. Some of it is not: a per-class classification, a retired
-name, an exception type. Those are the parts that rot silently, because Sphinx
+which no test can check. Some of it is not: a per-class classification, a forbidden
+role, an exception type. Those are the parts that rot silently, because Sphinx
 builds without ``-W`` and without ``nitpicky``, so a page whose every factual claim
 has gone stale still renders and CI still passes.
 
@@ -31,9 +31,6 @@
   against the declarations themselves. ``tests/protocols/internet/test_ipv6_ext_unit.py``
   already pins the *code* to the ruling; nothing pinned the *page* to the code, which is
   the half that goes stale when a new header lands.
-* :class:`RetiredNameTests` -- the #924 ruling that the ``IPv6_GenericExt`` name goes for
-  good. A ruling that a name must not exist is exactly the kind a later change
-  reintroduces without noticing.
 * :class:`FailedLookupExceptionTests` -- the worked example the page gives for a name
   miss, which names :exc:`~pcapkit.utilities.exceptions.EnumKeyError`, not the
   true but unspecific :exc:`KeyError` (#918).
@@ -48,13 +45,13 @@
 * :class:`AenumRoleExclusionTests` -- GitHub issue #934 part C's ruling that
   ``aenum`` cannot be cross-referenced at all (``conf.py`` excludes it: its
   ``objects.inv`` carries no ``py:`` objects), converted to plain literals rather
-  than roles. A forbidden role needs a test or it comes back, exactly as
-  :class:`RetiredNameTests` guards a retired name. Pins the other half of the same
-  fix alongside it: the sentinel references #934 part B qualified stay
-  qualified, since none of ``AbsentType``, ``NoValueType`` or ``ABSENT`` resolves
-  unqualified outside :file:`docs/source/pcapkit/corekit/sentinels.rst`'s own module
-  context. Both checks scan every split page rather than one file, since either
-  could in principle land on any of them.
+  than roles. A forbidden role needs a test or it comes back. Pins the other
+  half of the same fix alongside it: the sentinel references #934 part B
+  qualified stay qualified, since none of ``AbsentType``, ``NoValueType`` or
+  ``ABSENT`` resolves unqualified outside
+  :file:`docs/source/pcapkit/corekit/sentinels.rst`'s own module context. Both
+  checks scan every split page rather than one file, since either could in
+  principle land on any of them.
 
 * :class:`ProcessConventionTests` -- the *process* rulings #918 harvested onto
   :file:`process.rst`: what the ``all`` extra carries (#910), what a
@@ -370,9 +367,7 @@ def test_the_index_preamble_does_not_claim_to_be_a_ruling_page_itself(self) -> '
         never needs that phrase, since every true statement about ruling content
         here names a child page, or says "the pages below" / "here" for the set of
         them. Paired with a positive check that the standing-instruction phrase is
-        present, rather than merely that the single-page one is absent, following
-        :class:`RetiredNameTests`'s two-sided pattern for a retired name elsewhere
-        in this module.
+        present, rather than merely that the single-page one is absent.
 
         """
         text = INDEX.read_text(encoding='utf-8')
@@ -626,31 +621,6 @@ def test_the_page_agrees_with_the_test_that_pins_the_code(self) -> 'None':
                          set(IPv6ExtSharedBaseContractTests.STANDALONE_MEMBERS))
 
 
-class RetiredNameTests(unittest.TestCase):
-    """#924's ruling that ``IPv6_GenericExt`` goes: an unreleased intermediate name."""
-
-    def test_the_retired_base_name_is_absent_from_the_package(self) -> 'None':
-        """A ruling that a name must not exist needs a test, or it comes back.
-
-        Checked over the package source rather than by import, because the failure
-        this guards against is a *reintroduced alias* -- which would import perfectly
-        well and satisfy any behavioural assertion.
-
-        """
-        offenders = [str(path.relative_to(ROOT))
-                     for path in sorted((ROOT / 'pcapkit').rglob('*.py'))
-                     if 'IPv6_GenericExt' in path.read_text(encoding='utf-8')]
-        self.assertEqual(offenders, [],
-                         'the retired name is back; the ruling on GitHub pull request '
-                         '#924 is that it was an intermediate state and never released')
-
-    def test_the_shared_base_still_carries_the_name_the_ruling_left(self) -> 'None':
-        """The other half: the name was renamed, not simply removed."""
-        from pcapkit.protocols.internet.ipv6_ext import IPv6_Ext
-
-        self.assertEqual(IPv6_Ext.__name__, 'IPv6_Ext')
-
-
 class FailedLookupExceptionTests(unittest.TestCase):
     """The worked example the page gives for a lookup that does not resolve."""
 
@@ -693,8 +663,7 @@ class AenumRoleExclusionTests(unittest.TestCase):
     B converted every such role this page carried to plain double-backtick
     literals rather than leaving them promising a link that can never exist. A
     forbidden role needs a test, or a later edit reintroduces one without
-    noticing -- exactly the failure mode :class:`RetiredNameTests` guards a
-    retired name against.
+    noticing.
 
     The other half of the same fix is pinned alongside it: the references to
     ``AbsentType``, ``NoValueType`` and ``ABSENT`` that part B qualified to their
 
@@ -3,11 +3,10 @@
 
 The helper the TCP adapters of :mod:`pcapkit.toolkit.pcap` and
 :mod:`pcapkit.toolkit.pcapng` share was the private ``pcap._tcp_segment``, which
-``pcapng`` imported across modules, and its result type was the private
-``pcap._TCPSegment``. Under the rulings on #1519 a shared helper becomes public in
-the module both callers already import, as ``test_start_line`` did in #1525, so the
-two keep their names without the underscore and stay in ``pcap``, which ``pcapng``
-already imports. The adapters' end-to-end behaviour is covered by
+``pcapng`` imported across modules. Under the rulings on #1519 a shared helper
+becomes public in the module both callers already import, as ``test_start_line``
+did in #1525, so the helper and its result type are public and stay in ``pcap``,
+which ``pcapng`` already imports. The adapters' end-to-end behaviour is covered by
 ``tests/toolkit/test_pcap_tcp_segment_unit.py``; these tests pin the public surface
 and that both toolkits read the segment through it.
 
@@ -96,7 +95,7 @@ def test_callers_share_the_public_helper(self) -> None:
         from pcapkit.toolkit import pcap, pcapng
 
         self.assertIs(pcapng.tcp_segment, pcap.tcp_segment)
-        for module, name in ((pcap, '_tcp_segment'), (pcap, '_TCPSegment'), (pcapng, '_tcp_segment')):
+        for module, name in ((pcap, '_tcp_segment'), (pcapng, '_tcp_segment')):
             with self.subTest(module=module.__name__, name=name):
                 self.assertFalse(hasattr(module, name))