fix: use cache for input files instead of hardcoded paths

tasks.py

@@ -54,12 +54,11 @@ def render_effect(self, input_hash: str, effect_name: str, output_name: str) ->
     Returns:
         Provenance record with output hash
     """
-    # Registry hashes
+    # Cache directory (shared between server and worker)
+    CACHE_DIR = Path(os.environ.get("CACHE_DIR", str(Path.home() / ".artdag" / "cache")))
+
+    # Registry hashes (for effects/infra metadata only)
     REGISTRY = {
-        "cat": {
-            "hash": "33268b6e167deaf018cc538de12dbe562612b33e89a749391cef855b320a269b",
-            "path": Path.home() / "artdag-art" / "cat.jpg"
-        },
         "effect:dog": {
             "hash": "d048fe313433eb4e38f0e24194ffae91b896ca3e6eed3e50b2cc37b7be495555"
         },
@@ -74,27 +73,19 @@ def render_effect(self, input_hash: str, effect_name: str, output_name: str) ->
         }
     }
 
-    # Find input by hash
-    input_asset = None
-    input_name = None
-    for name, data in REGISTRY.items():
-        if data.get("hash") == input_hash and "path" in data:
-            input_asset = data
-            input_name = name
-            break
+    # Input comes from cache by hash
+    input_path = CACHE_DIR / input_hash
+    if not input_path.exists():
+        raise ValueError(f"Input not in cache: {input_hash}")
 
-    if not input_asset:
-        raise ValueError(f"Unknown input hash: {input_hash}")
-
-    input_path = input_asset["path"]
-    output_dir = Path.home() / "artdag-art"
+    output_dir = CACHE_DIR
 
     # Verify input
     actual_hash = file_hash(input_path)
     if actual_hash != input_hash:
         raise ValueError(f"Input hash mismatch: expected {input_hash}, got {actual_hash}")
 
-    self.update_state(state='RENDERING', meta={'effect': effect_name, 'input': input_name})
+    self.update_state(state='RENDERING', meta={'effect': effect_name, 'input': input_hash[:16]})
 
     # Load and apply effect
     if effect_name == "dog":
@@ -126,7 +117,7 @@ def render_effect(self, input_hash: str, effect_name: str, output_name: str) ->
             "local_path": str(result)
         },
         "inputs": [
-            {"name": input_name, "content_hash": input_hash}
+            {"content_hash": input_hash}
         ],
         "effects": [
             {"name": f"effect:{effect_name}", "content_hash": REGISTRY[f"effect:{effect_name}"]["hash"]}