Fix SOURCE node resolution for user inputs in execute_recipe

- SOURCE nodes with :input true now resolve CID from input_hashes
- Tries multiple name formats: exact, lowercase-dashes, lowercase-underscores
- Only return "completed" status for runs with actual output
- Add integration tests for SOURCE CID resolution

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

legacy_tasks.py

@@ -734,6 +734,26 @@ def execute_recipe(self, recipe_sexp: str, input_hashes: Dict[str, str], run_id:
                 # Handle SOURCE nodes
                 if step.node_type == "SOURCE":
                     source_cid = step.config.get("cid")
+
+                    # If source has :input true, resolve CID from input_hashes
+                    if not source_cid and step.config.get("input"):
+                        source_name = step.config.get("name", "")
+                        # Try various key formats for lookup
+                        name_variants = [
+                            source_name,
+                            source_name.lower().replace(" ", "-"),
+                            source_name.lower().replace(" ", "_"),
+                            source_name.lower(),
+                        ]
+                        for variant in name_variants:
+                            if variant in input_hashes:
+                                source_cid = input_hashes[variant]
+                                logger.info(f"Resolved SOURCE '{source_name}' -> {source_cid[:16]}... via '{variant}'")
+                                break
+
+                        if not source_cid:
+                            raise ValueError(f"SOURCE '{source_name}' not found in input_hashes. Available: {list(input_hashes.keys())}")
+
                     if source_cid:
                         source_path = cache_manager.get_by_cid(source_cid)
                         if source_path:
@@ -747,7 +767,9 @@ def execute_recipe(self, recipe_sexp: str, input_hashes: Dict[str, str], run_id:
                             total_cached += 1
                             continue
                         else:
-                            raise ValueError(f"Source content not found: {source_cid}")
+                            raise ValueError(f"Source content not found in cache: {source_cid[:16]}...")
+                    else:
+                        raise ValueError(f"SOURCE step has no cid and no :input flag: {step.config}")
 
                 # Get executor for this step type
                 executor = get_executor(step.node_type)