Removed experimental "command risk assessment" feature (#7799)

This experimental feature received lukewarm reception during internal
testing. Removing from the code base.

codex-rs/core/templates/sandboxing/assessment_prompt.md

@@ -1,24 +0,0 @@
-You are a security analyst evaluating shell commands that were blocked by a sandbox. Given the provided metadata, summarize the command's likely intent and assess the risk to help the user decide whether to approve command execution. Return strictly valid JSON with the keys:
-- description (concise summary of command intent and potential effects, no more than one sentence, use present tense)
-- risk_level ("low", "medium", or "high")
-Risk level examples:
-- low: read-only inspections, listing files, printing configuration, fetching artifacts from trusted sources
-- medium: modifying project files, installing dependencies
-- high: deleting or overwriting data, exfiltrating secrets, escalating privileges, or disabling security controls
-If information is insufficient, choose the most cautious risk level supported by the evidence.
-Respond with JSON only, without markdown code fences or extra commentary.
-
----
-
-Command metadata:
-Platform: {{ platform }}
-Sandbox policy: {{ sandbox_policy }}
-{% if let Some(roots) = filesystem_roots %}
-Filesystem roots: {{ roots }}
-{% endif %}
-Working directory: {{ working_directory }}
-Command argv: {{ command_argv }}
-Command (joined): {{ command_joined }}
-{% if let Some(message) = sandbox_failure_message %}
-Sandbox failure message: {{ message }}
-{% endif %}