The existing `wire_format.rs` should share more types with the `codex-protocol` crate (like `AskForApproval` instead of maintaining a parallel `CodexToolCallApprovalPolicy` enum), so this PR moves `wire_format.rs` into `codex-protocol`, renaming it as `mcp-protocol.rs`. We also de-dupe types, where appropriate. --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/openai/codex/pull/2423). * #2424 * __->__ #2423
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