Add COMPOUND node handling and fix cache lookups by code-addressed hash

- Add COMPOUND node handling in execute_recipe for collapsed effect chains
- Index cache entries by node_id (cache_id) when different from IPFS CID
- Fix test_cache_manager.py to unpack put() tuple returns

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

cache_manager.py

@@ -325,6 +325,12 @@ class L1CacheManager:
         self._set_content_index(cid, node_id)
         logger.info(f"put: Set content index {cid[:16]}... -> {node_id[:16]}...")
 
+        # Also index by node_id itself (for code-addressed cache lookups)
+        # This allows get_by_cid(cache_id) to work when cache_id != IPFS CID
+        if node_id != cid:
+            self._set_content_index(node_id, node_id)
+            logger.debug(f"Self-indexed: {node_id[:16]}... -> {node_id[:16]}...")
+
         # Also index by local hash if cid is an IPFS CID
         # This ensures both IPFS CID and local hash can be used to find the file
         if local_hash and local_hash != cid: