Preserve changelogs/current/PLACEHOLDER.txt in entries-layout changelog writes

[Copilot]

AChangelogs.write_version() and write_current() in entries-layout mode could leave changelogs/current/ empty after writing a release/dev changelog. That removed current/PLACEHOLDER.txt, which Envoy’s changelog filegroup expects, and caused downstream workflow failures.

• Root cause addressed

  • Entries-layout flows recreated changelogs/current/ but did not restore the tracked placeholder file.

• Code changes

  • Added CHANGELOG_CURRENT_PLACEHOLDER = "PLACEHOLDER.txt" in the changelog constants.
  • Added AChangelogs.current_placeholder_path:
    • self.current_dir_path.joinpath(CHANGELOG_CURRENT_PLACEHOLDER).
  • Updated entries-layout write_current() to ensure directory + placeholder:
    • mkdir(..., exist_ok=True) then current_placeholder_path.touch().
  • Updated entries-layout write_version() to restore placeholder after clearing/recreating current/:
    • shutil.rmtree(...), mkdir(), then current_placeholder_path.touch().

• Test updates

  • Added unit coverage for current_placeholder_path.
  • Extended write_current / write_version tests to assert touch() behavior on entries-layout vs legacy paths.
  • Extended parse-error path test to assert placeholder is not touched on failure.
  • Updated entries-layout end-to-end test to assert post-write_version state contains exactly one file: empty PLACEHOLDER.txt.

if self.entries_layout:
    self.current_dir_path.mkdir(parents=True, exist_ok=True)
    self.current_placeholder_path.touch()

# ...
if self.entries_layout:
    data = self.changelog_class.get_data_from_entries(self.current_dir_path)
    data["date"] = self.datestamp
    version_file.write_text(self.dump_yaml(data))
    shutil.rmtree(self.current_dir_path)
    self.current_dir_path.mkdir()
    self.current_placeholder_path.touch()

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