feat(immich): write-back (upsert_tag, tag_assets) + _pipeline tag conventions

shared/tests/test_pipeline.py

@@ -0,0 +1,15 @@
+from photoflow.immich import pipeline
+
+
+def test_constants_and_helpers():
+    assert pipeline.ROOT == "_pipeline"
+    assert pipeline.PROCESSED == "_pipeline/processed"
+    assert pipeline.NON_TRIP == "_pipeline/non-trip"
+    assert pipeline.ai_rating(4) == "_pipeline/ai-rating/4"
+
+
+def test_is_pipeline_tag():
+    assert pipeline.is_pipeline_tag("_pipeline/processed") is True
+    assert pipeline.is_pipeline_tag("_pipeline") is True
+    assert pipeline.is_pipeline_tag("Italy 2019") is False
+    assert pipeline.is_pipeline_tag("Kiev") is False