fix: resolve 3 starter crash root causes — Docker home dir, path depth, import rewriting

1. EACCES on /home/app: Dockerfile templates now create home dir for
   non-root user before USER app (langgraph-ts, claude-sdk-ts, mastra)
2. IndexError Path.parents[4]: search_flights.py schema fallback now
   guards against shallow Docker paths (agno, claude-sdk-py, ms-agent-py)
3. Wrong import path: rewritePythonImports() now converts
   from agents.X to relative imports in starter agent dirs (langroid, crewai)

Author: jpr5

showcase/scripts/generate-starters.ts

@@ -328,6 +328,14 @@ function rewritePythonImports(filePath: string, _agentDir: string): void {
     "$1from .$2 import ",
   );
 
+  // Rewrite "from agents.X import ..." to "from .X import ..."
+  // When the demo "agents/" dir is renamed to "agent/" in starters,
+  // intra-package absolute imports break. Convert to relative imports.
+  content = content.replace(
+    /^(\s*)from agents\.([\w.]+) import /gm,
+    "$1from .$2 import ",
+  );
+
   fs.writeFileSync(filePath, content);
 }
 

showcase/shared/python/tools/search_flights.py

@@ -36,13 +36,17 @@
 
 # Fallback: use the schema from the examples directory if present
 if _flight_schema is None:
-    _fallback = Path(__file__).resolve().parents[4] / (
-        "examples/integrations/langgraph-python/apps/agent/src/a2ui/schemas/flight_schema.json"
-    )
-    if _fallback.exists():
-        with open(_fallback) as _f:
-            _flight_schema = json.load(_f)
-        _logger.info("Loaded flight schema from examples fallback: %s", _fallback)
+    try:
+        _fallback = Path(__file__).resolve().parents[4] / (
+            "examples/integrations/langgraph-python/apps/agent/src/a2ui/schemas/flight_schema.json"
+        )
+        if _fallback.exists():
+            with open(_fallback) as _f:
+                _flight_schema = json.load(_f)
+            _logger.info("Loaded flight schema from examples fallback: %s", _fallback)
+    except IndexError:
+        # In Docker the file path is too shallow for parents[4]; skip this fallback.
+        pass
 
 # Last resort: inline minimal schema
 if _flight_schema is None: