envoy.code.check: remove stale entries_layout access in changelog date validation

[Copilot]

envoy.base.utils removed AChangelogs.entries_layout, but envoy.code.check still referenced it in AChangelogStatus.check_date, causing an AttributeError at runtime when checking current changelogs. This PR aligns envoy.code.check with the one-layout model and hardens the test that previously masked the stale lookup.

• Date-check logic update (AChangelogStatus.check_date)

  • Drop project.changelogs.entries_layout from the current-changelog guard.
  • Current changelog now always short-circuits date validation:

  async def check_date(self) -> tuple[str, ...]:
      if self.is_current:
          return ()
      ...

• Test hardening (test_abstract_changelog.py)

  • Tighten test_changelogstatus_check_date_current by patching AChangelogStatus.project via PropertyMock and asserting it is not accessed, so stale project.changelogs.* lookups cannot pass via truthy MagicMock chains.
  • Remove now-unneeded project mocking from test_changelogstatus_check_date.

• entries_layout cleanup scope

  • Remove remaining entries_layout usage under py/envoy.code.check (source/tests), keeping changes limited to this fix path only.

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