fix(core): recover from hallucinated tool names instead of ending the scan

A tool call for a name Strix does not register raised ModelBehaviorError
from the SDK turn resolver, which nothing retries: the root agent's raise
tore down the whole scan and a sub-agent died before its status was set.
Opt into the SDK's tool_not_found_behavior="return_error_to_model" so the
unknown call comes back as a tool result and the agent self-corrects.

The setting landed in openai-agents 0.19.0, which requires openai>=2.45,
so both pins move.

uv.lock

@@ -1384,7 +1384,7 @@ wheels = [
 
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+version = "2.53.0"
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@@ -1396,14 +1396,14 @@ dependencies = [
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     { name = "typing-extensions" },
 ]
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+    { url = "https://files.pythonhosted.org/packages/78/0f/cc6afea3542a5142c5d8fc8211c5e059a8375105d004a41dfa2c7948dbb0/openai-2.53.0-py3-none-any.whl", hash = "sha256:c694ffc747a3c4d1663ef2b07b811315a476164ee5efa3a993967349ebca7618", size = 1659829, upload-time = "2026-08-03T21:41:59.581Z" },
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 [[package]]
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-version = "0.14.6"
+version = "0.19.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "griffelib" },
@@ -1411,13 +1411,12 @@ dependencies = [
     { name = "openai" },
     { name = "pydantic" },
     { name = "requests" },
-    { name = "types-requests" },
     { name = "typing-extensions" },
     { name = "websockets" },
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+    { url = "https://files.pythonhosted.org/packages/3b/3a/bac1aa3405c0f11b4334ac999e881d08fa40fad1f3b7229a1ca222ada489/openai_agents-0.19.0-py3-none-any.whl", hash = "sha256:25392cff993eca7c75b0679ec8d0111faef20c517222c0193111097d0f70db7a", size = 928463, upload-time = "2026-07-27T22:49:24.405Z" },
 ]
 
 [package.optional-dependencies]
@@ -2426,8 +2425,8 @@ requires-dist = [
     { name = "docker", specifier = ">=7.1.0" },
     { name = "google-auth", marker = "extra == 'vertex'", specifier = ">=2.0.0" },
     { name = "litellm" },
-    { name = "openai", specifier = ">=2.26.0,<2.45" },
-    { name = "openai-agents", extras = ["litellm"], specifier = "==0.14.6" },
+    { name = "openai", specifier = ">=2.45.0,<3" },
+    { name = "openai-agents", extras = ["litellm"], specifier = ">=0.19.0,<0.20" },
     { name = "pydantic", specifier = ">=2.11.3" },
     { name = "pydantic-settings", specifier = ">=2.13.0" },
     { name = "pypdf", specifier = ">=5.0" },
@@ -2550,18 +2549,6 @@ wheels = [
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