--skills-only --scope project incorrectly skips Codex

[rob7thousand]

Describe the issue

databricks aitools install skips Codex when --scope project and
--skills-only are used together:

Skipped Codex CLI: does not support project-scoped skills

Codex supports repository-scoped raw skills under
<repo>/.agents/skills:

https://developers.openai.com/codex/skills#where-codex-loads-local-skills

Codex does not appear to support project-scoped plugin installation:
codex plugin add and codex plugin marketplace add expose no project
or --scope option. However, plugin scope should not prevent installation
when --skills-only explicitly requests raw skill files.

Steps to reproduce

Run from a project directory:

databricks aitools install \
  --agents claude-code,codex \
  --scope project \
  --skills-only

Expected behavior

Because --skills-only explicitly requests raw skill files, the CLI should
install the Codex skills into:

<project>/.agents/skills

Claude Code should continue using:

<project>/.claude/skills

Whether Codex plugins support project scope should not affect the
--skills-only installation path.

Actual behavior

Claude Code is processed, but Codex is skipped:

Skipped Codex CLI: does not support project-scoped skills

Possible cause

The agent model appears to use a single SupportsProjectScope capability:

https://github.com/databricks/cli/blob/main/libs/aitools/agents/agents.go

The Codex registry entry does not set SupportsProjectScope or
ProjectConfigDir, so SupportsProjectScope defaults to false.

This may correctly reflect the lack of project-scoped Codex plugin
installation, but it also blocks project-scoped raw skills when
--skills-only is used.

The capabilities may need to be distinguished by delivery method, for
example:

• Project-scoped plugin installation
• Project-scoped raw-skill installation

For Codex, raw-skill project scope should be enabled with a project
configuration directory of .agents, producing:

<project>/.agents/skills

Environment

Databricks CLI v1.12.1
Codex CLI 0.147.0

Related issue

Related to #6037, which proposes installing skills into the
vendor-neutral .agents/skills directory. This report specifically
concerns --skills-only being rejected because Codex plugin and
raw-skill scope capabilities appear to be treated as one capability.