Add codex-mcp-internal server exposing internal tooling

[hackall360]

Summary

• add a new codex-mcp-internal binary that launches the MCP server in internal tooling mode
• implement an InternalToolRegistry to expose shell, apply_patch, update_plan, and view_image tools over MCP
• make the message processor mode-aware so the internal server can list and handle internal tools while still supporting the gateway

Testing

• just fmt
• just fix -p codex-mcp-server
• cargo test -p codex-mcp-server

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https://chatgpt.com/codex/tasks/task_b_68d9e57199e4832f9f5a2057c2b520eb

[chatgpt-codex-connector]

💡 Codex Review

codex-extended/codex-rs/cli/src/mcp_cmd.rs

Lines 97 to 99 in 3d4764d

	match subcommand {
	McpSubcommand::Serve => {
	codex_mcp_server::run_main(codex_linux_sandbox_exe, config_overrides).await?;

[P0] Fix CLI compile error after run_main API change

The new codex_mcp_server::run_main now requires a ServerMode argument, but the CLI still invokes it with only the sandbox path and config overrides. This call no longer matches the function signature and causes the codex-cli crate to stop compiling when building the workspace. Pass the appropriate ServerMode (likely ServerMode::CodexGateway) here so the CLI continues to build.

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