Transform Codex spawn_agent/wait_agent/close_agent into unified Agent
card display: rewrite spawn_agent as "Agent" tool with subagent_type,
prompt, and description; correlate final results from wait_agent and
close_agent outputs; parse sub-agent session JSONL files for nested
tool call lists; suppress intermediate status messages during agent
execution; clean exec_command output to show only the command and its
result.
Render Agent/Explore/Plan tool calls in a visually distinct collapsible
container with colored left border, replacing the generic tool card. Parse
subagent JSONL transcripts from {sessionId}/subagents/ to extract and
display the actual tool calls (Bash, Read, Grep, etc.) the subagent
executed, reusing the existing ToolCallPart for consistent appearance.
- Add AgentToolCallPart component with collapsible body, prompt section,
execution stats, and nested tool call list via render prop injection
- Add AgentExecutionStats and AgentToolCall types (Rust + TypeScript)
- Parse toolUseResult.agentId to locate and read subagent JSONL files
- Validate agentId against path traversal before filesystem access
- Pass agentStats through adapter for both ID-matched and positional
tool result pairing
- Strip agentStats in nested render to prevent recursive Agent expansion
- Add i18n keys for agent UI labels across all 10 languages
