Document name-based selectors for skills.config

What is the type of issue?

Documentation is missing.

What is the issue?

The Codex configuration reference documents skills.config, skills.config.<index>.enabled, and the path-based skills.config.<index>.path, but it omits the supported name-based skills.config.<index>.name selector.

This omission matters particularly for plugin-contributed skills. A path selector can contain a versioned plugin-cache directory and become stale when the plugin version changes, while a qualified name selector continues matching the same logical plugin skill:

[[skills.config]]
name = "aws-core:aws-storage"
enabled = false

Please document:

• skills.config.<index>.name as a string selector for an effective skill name.
• Plugin-contributed skills use qualified names such as plugin-name:skill-name.
• An entry should set exactly one of name or path; the current implementation ignores entries with both or neither.
• Name selectors survive plugin cache/version path changes, but must be updated if the plugin or skill itself is renamed.

This behavior is present in the tagged Codex 0.151.0 source:

• SkillConfig supports both path and name selectors
• Plugin tests disable a skill with a qualified name

The underlying per-plugin-skill use case was previously described in #19268.

Where did you find it?

https://learn.chatgpt.com/docs/config-file/config-reference

The reference currently ends the per-skill selector documentation at skills.config.<index>.path.

Start with the Codex configuration reference at learn.chatgpt.com/docs/config-file/config-reference, then verify the supported fields in codex-rs/config/src/skills_config.rs and the qualified-name example in codex-rs/core-plugins/src/manager_tests.rs. Done means the reference documents the name selector, qualified plugin names, the exclusive name-or-path rule, and rename/cache-version behavior.