feat(chat): add workspace chat, attachments and agent delegation

backend/uv.lock

@@ -373,6 +373,7 @@ dependencies = [
     { name = "fastapi" },
     { name = "httpx" },
     { name = "jsonschema" },
+    { name = "olefile" },
     { name = "pyyaml" },
     { name = "referencing" },
     { name = "sqlite-vec" },
@@ -390,6 +391,7 @@ requires-dist = [
     { name = "fastapi", specifier = ">=0.116,<1.0" },
     { name = "httpx", specifier = ">=0.28,<1.0" },
     { name = "jsonschema", specifier = ">=4.25,<5.0" },
+    { name = "olefile", specifier = ">=0.47" },
     { name = "pyyaml", specifier = ">=6.0,<7.0" },
     { name = "referencing", specifier = ">=0.36,<1.0" },
     { name = "sqlite-vec", specifier = ">=0.1.9" },
@@ -399,6 +401,15 @@ requires-dist = [
 [package.metadata.requires-dev]
 dev = [{ name = "pytest", specifier = ">=8.4,<9.0" }]
 
+[[package]]
+name = "olefile"
+version = "0.47"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/69/1b/077b508e3e500e1629d366249c3ccb32f95e50258b231705c09e3c7a4366/olefile-0.47.zip", hash = "sha256:599383381a0bf3dfbd932ca0ca6515acd174ed48870cbf7fee123d698c192c1c", size = 112240, upload-time = "2023-12-01T16:22:53.025Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/17/d3/b64c356a907242d719fc668b71befd73324e47ab46c8ebbbede252c154b2/olefile-0.47-py2.py3-none-any.whl", hash = "sha256:543c7da2a7adadf21214938bb79c83ea12b473a4b6ee4ad4bf854e7715e13d1f", size = 114565, upload-time = "2023-12-01T16:22:51.518Z" },
+]
+
 [[package]]
 name = "packaging"
 version = "26.3"