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## Why [#23883](https://github.com/openai/codex/pull/23883) moved user-facing `--profile` selection onto profile v2, and [#23886](https://github.com/openai/codex/pull/23886) removed the old CLI `config_profile` override path. Core still had a second legacy path: `profile = "..."` could select `[profiles.*]` values while runtime config was built. Keeping that resolver alive preserves the old precedence model and profile-carrying surfaces even though profile selection now points at `$CODEX_HOME/<name>.config.toml`. ## What - Reject legacy top-level `profile = "..."` config while loading runtime config, with an error that points callers at `--profile <name>` and `<name>.config.toml` in the [core load path](3d923366ec/codex-rs/core/src/config/mod.rs (L2524-L2531)). - Remove the remaining profile-v1 merge points from runtime config resolution, including features, permissions, model/provider selection, web search, Windows sandbox settings, TUI settings, role reloads, and OSS provider lookup. - Drop the leftover profile override surface from [`ConfigOverrides`](3d923366ec/codex-rs/core/src/config/mod.rs (L2118-L2148)) and from the MCP server `codex` tool schema. - Prune profile-precedence tests that only exercised the removed resolver and replace them with rejection coverage for the legacy selector. ## Testing - Not run in this metadata pass. - Added [`legacy_profile_selection_is_rejected`](3d923366ec/codex-rs/core/src/config/config_tests.rs (L7942-L7965)) coverage for the new runtime guard.