Re-enable current changelog entry-file validation by fixing entry_dir resolution

[Copilot]

AChangelogStatus.entry_dir resolved current entries to changelogs/<version> (derived from <version>.yaml), so check_entry_files exited early and never ran filename/content validation for current changelogs. This change points entry discovery at changelogs/current and turns a missing current entries directory into an explicit error instead of a silent no-op.

• Entry directory resolution (current changelog)

  • AChangelogStatus.entry_dir now returns self.project.changelogs.current_dir_path when is_current, else None.
  • Removed dependence on changelog_path(version).with_suffix("").

• Missing-directory behavior

  • check_entry_files now distinguishes:
    • entry_dir is None (non-current): return ()
    • current entry_dir missing: return "{version}: Missing changelog entries directory ({entry_dir})"
    • current entry_dir exists but no */*.rst entries: return ()

• Test updates

  • Updated test_changelogstatus_entry_dir to assert current_dir_path is used and changelog_path/with_suffix/version are not used in current mode.
  • Extended test_changelogstatus_check_entry_files to cover missing-directory error and empty-directory no-op.
  • Added tmp-path end-to-end coverage that builds a minimal changelog layout and verifies an unknown area in current/<section>/<area>__<slug>.rst surfaces via AChangelogStatus.errors as Invalid area.

@property
def entry_dir(self) -> pathlib.Path | None:
    if not self.is_current:
        return None
    return self.project.changelogs.current_dir_path

async def check_entry_files(self) -> tuple[str, ...]:
    entry_dir = self.entry_dir
    if entry_dir is None:
        return ()
    if not entry_dir.exists():
        return (f"{self.version}: Missing changelog entries directory ({entry_dir})", )

This re-enables validation that had been silently skipped; downstream consumers (notably Envoy) may surface pre-existing Invalid area / filename errors once this version is adopted.

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