Send completion notifications when renaming is disabled

[JSap0914]

Summary

• return a download-completion notification when rename_method is none and the generated path is unchanged
• keep the existing behavior of skipping the rename operation and not adding the ab:renamed tag
• preserve unchanged-path behavior for normal rename methods

Fixes #1082

Tests

• uv run pytest src/test/test_renamer.py::TestRenameFile::test_none_method_notifies_without_rename_or_tag src/test/test_renamer.py::TestRenameFile::test_same_path_skipped -q (2 passed)
• uv run pytest src/test/test_renamer.py -q (96 passed)
• uv run pytest src/test -q -m 'not e2e' --basetemp <isolated-temp-dir> (2027 passed, 3 skipped, 27 deselected)
• uv run ruff check src
• uv run mypy src
• uv run black --check src/module/manager/renamer.py src/test/test_renamer.py

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