Teach Skill path resolution to accept the common $skill invocation form in addition to bare names and /skill prefixes. Keep the behavior narrow and add regression coverage using the existing help skill fixture.
Constraint: Must not touch unrelated dirty api files in this worktree
Constraint: Keep the change limited to rust/crates/tools
Rejected: Canonicalize the returned skill field to the resolved name | would change caller-visible output semantics unnecessarily
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep invocation-prefix normalization aligned with how prompt and skill references are written elsewhere in the CLI
Tested: cargo test -p tools
Not-tested: CODEX_HOME layouts with unusual symlink arrangements
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