This updates the schema in `generate_mcp_types.py` from `2025-03-26` to `2025-06-18`, regenerates `mcp-types/src/lib.rs`, and then updates all the code that uses `mcp-types` to honor the changes. Ran ``` npx @modelcontextprotocol/inspector just codex mcp ``` and verified that I was able to invoke the `codex` tool, as expected. --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/openai/codex/pull/1621). * #1623 * #1622 * __->__ #1621