refactor: DLO-16/17/18/20 — CLI simplification, config Pydantic, planner split, type system unification

DLO-16: Reduce cli.py from 1073 to 83 lines by registering Click commands from commands/*.py modules
DLO-17: Migrate Config to Pydantic BaseModel for validation
DLO-18: Split planner.py (826 lines) into orchestration, path rendering, and duplicate handling modules
DLO-20: Unify type system — convert 14 dataclasses to Pydantic BaseModel, keep TypedDicts as JSON schema hints

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

tests/test_enrichment.py

@@ -38,9 +38,10 @@ def test_enrich_incremental_cache_hit(tmp_path, monkeypatch):
     config = Config(
         library_root=tmp_path,
         enrichment_cache_db=tmp_path / "cache.db",
-        enrichment_providers=["dummy"],
+        enrichment_providers=["tmdb"],
         translation_fallback_machine=False,
     )
+    config.enrichment_providers = ["dummy"]
 
     provider = DummyProvider()
     monkeypatch.setattr(
@@ -104,11 +105,12 @@ def test_enrich_flags_low_reputation_for_review(tmp_path, monkeypatch):
     config = Config(
         library_root=tmp_path,
         enrichment_cache_db=tmp_path / "cache.db",
-        enrichment_providers=["dummy"],
+        enrichment_providers=["tmdb"],
         translation_fallback_machine=False,
         reputation_low_score_threshold=6.0,
         reputation_min_votes=50,
     )
+    config.enrichment_providers = ["dummy"]
 
     provider = LowScoreProvider()
     monkeypatch.setattr(
@@ -144,9 +146,10 @@ def test_enrich_refresh_all_bypasses_cache(tmp_path, monkeypatch):
     config = Config(
         library_root=tmp_path,
         enrichment_cache_db=tmp_path / "cache.db",
-        enrichment_providers=["dummy"],
+        enrichment_providers=["tmdb"],
         translation_fallback_machine=False,
     )
+    config.enrichment_providers = ["dummy"]
 
     provider = DummyProvider()
     monkeypatch.setattr(
@@ -184,8 +187,9 @@ def test_build_providers_rejects_unknown_provider(tmp_path):
     """Unknown providers should fail fast with a clear error."""
     config = Config(
         library_root=tmp_path,
-        enrichment_providers=["tmdb", "tmdb_typo"],
+        enrichment_providers=["tmdb"],
     )
+    config.enrichment_providers = ["tmdb", "tmdb_typo"]
 
     with pytest.raises(ValueError, match="Unsupported enrichment providers"):
         _build_providers(config, request_timeout=3, retries=1, rate_limiter=RequestRateLimiter(0.25))
@@ -220,9 +224,10 @@ def test_refresh_all_clears_stale_enrichment_fields(tmp_path, monkeypatch):
     config = Config(
         library_root=tmp_path,
         enrichment_cache_db=tmp_path / "cache.db",
-        enrichment_providers=["dummy"],
+        enrichment_providers=["tmdb"],
         translation_fallback_machine=False,
     )
+    config.enrichment_providers = ["dummy"]
 
     provider = FlakyProvider()
     monkeypatch.setattr(
@@ -361,10 +366,11 @@ def test_enrich_respects_max_concurrency_for_uncached_records(tmp_path, monkeypa
     config = Config(
         library_root=tmp_path,
         enrichment_cache_db=tmp_path / "cache.db",
-        enrichment_providers=["dummy"],
+        enrichment_providers=["tmdb"],
         translation_fallback_machine=False,
         enrichment_max_concurrency=4,
     )
+    config.enrichment_providers = ["dummy"]
 
     identities = {
         "metadata": {},