refactor(e2b): drop obsolete host sandbox overlay

examples/headless-agent/e2b.cordis.snapshot.yml

@@ -29,8 +29,6 @@
             name: '@deepseek-ai/dsh-code-runtime-subprocess'
           - id: tool-cordis
             name: '@deepseek-ai/dsh-tool-cordis'
-          - id: sandbox
-            name: '@deepseek-ai/dsh-sandbox-local'
           - id: sandbox-policy
             name: '@deepseek-ai/dsh-sandbox-policy'
             config:

examples/headless-agent/e2b.cordis.yml

@@ -34,8 +34,6 @@
             name: '@deepseek-ai/dsh-fs-e2b'
           - id: code-runtime-subprocess
             name: '@deepseek-ai/dsh-code-runtime-subprocess'
-          - id: sandbox
-            name: '@deepseek-ai/dsh-sandbox-local'
           - id: sandbox-policy
             name: '@deepseek-ai/dsh-sandbox-policy'
             config:

examples/headless-agent/tests/fixtures/e2b/e2b/cordis.yml

@@ -21,9 +21,6 @@
 - id: agents
   name: '@deepseek-ai/dsh-agent'
 
-- id: sandbox
-  name: '@deepseek-ai/dsh-sandbox-local'
-
 - id: sandbox-policy
   name: '@deepseek-ai/dsh-sandbox-policy'
   config: