[auto-dev]: Auto discovery of auto-dev skills

[galagam]

🚀 The feature, motivation and pitch

auto-dev skills were added in https://gitlab-master.nvidia.com/autodeploy/auto-dev/-/merge_requests/42
The skills are positioned as part of the repository, and aren't automatically discoverable by agents.
Resolve this to allow auto-discovery.

Main alternatives:

1. Register as auto-dev claude/codex plugin - standardized mechanism
2. Symlink to user's main skill dir on auto-dev install (see draft here: https://gitlab-master.nvidia.com/autodeploy/auto-dev/-/merge_requests/42/diffs?commit_id=4a7f99bdfea7977f1c7ab3d88d117b77cece5f81)

Considerations:

1. Agent-agnostic, minimally discoverable by both claude and codex
2. Skills auto-update along with auto-dev
3. Automatic installation - users use various clusters, we don't want an additional manual setup step
4. Easy maintenance - skills are expected to be updated regularly with auto-dev

Alternatives

No response

Additional context

No response

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