[codex] Add quiet terminal mode for agents

[hengyunabc]

Summary

• add session-level quiet mode and suppress welcome output for agent sessions
• pass quiet session creation through MCP command execution and HTTP websocket terminal setup
• add arthas-client --quiet support with the arthas-agent terminal type
• remove the compatibility no-arg/default CommandExecutor.createSession() path so session creation is explicit

Validation

• ./mvnw -pl arthas-mcp-server -Dtest=ArthasCommandSessionManagerQuietTest,ArthasCommandContextAuthTest,DefaultCreateTaskContextAuthTest test
• ./mvnw -pl core -am -Dtest=ShellImplQuietTest,TtyWebSocketFrameHandlerQuietTest,CommandExecutorImplQuietSessionTest -Dsurefire.failIfNoSpecifiedTests=false test
• ./mvnw -pl client -DskipTests compile
• ./mvnw -pl core -am -DskipITs test
• git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Handle prompts at column 0 for quiet batch sessions

When --quiet is combined with -c/-f, this terminal type suppresses the welcome banner, so the first server output can be the prompt itself at the start of the stream. batchModeRun only releases the command loop when line.indexOf(PROMPT) > 0, so a prompt at index 0 is ignored and the client hangs indefinitely with the default timeout before sending the first command. Either avoid quiet mode for batch runs or update the prompt detection to accept index 0.

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