Fix duplicate get_by_cid method shadowing recipe lookup

Bug: Two get_by_cid methods existed in L1CacheManager. The second
definition shadowed the first, breaking recipe lookup because the
comprehensive method (using find_by_cid) was hidden.

- Remove duplicate get_by_cid method (lines 470-494)
- Add regression test to ensure only one get_by_cid exists
- Add tests for template variables and recipe visibility

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

cache_manager.py

@@ -467,32 +467,6 @@ class L1CacheManager:
 
         return None
 
-    def get_by_cid(self, ipfs_cid: str) -> Optional[Path]:
-        """Get cached file path by IPFS CID. Fetches from IPFS if not in local cache."""
-
-        # Check if we have this CID cached locally (indexed by CID)
-        cached_path = self.legacy_dir / ipfs_cid
-        if cached_path.exists() and cached_path.is_file():
-            return cached_path
-
-        # Check cache directory structure
-        cid_cache_dir = self.cache_dir / ipfs_cid
-        if cid_cache_dir.exists() and cid_cache_dir.is_dir():
-            # Look for output file
-            for f in cid_cache_dir.iterdir():
-                if f.is_file() and not f.name.endswith('.json'):
-                    return f
-
-        # Fetch from IPFS
-        logger.info(f"Fetching from IPFS: {ipfs_cid[:16]}...")
-        recovery_path = self.legacy_dir / ipfs_cid
-        recovery_path.parent.mkdir(parents=True, exist_ok=True)
-        if ipfs_client.get_file(ipfs_cid, recovery_path):
-            logger.info(f"Fetched from IPFS: {recovery_path}")
-            return recovery_path
-
-        return None
-
     def has_content(self, cid: str) -> bool:
         """Check if content exists in cache."""
         return self.get_by_cid(cid) is not None