[danew]

Summary

• Add client-neutral CLI installation and first-use guidance.
• Reuse the installed executable across tool calls instead of treating PATH issues as a reason to switch CLI packages.
• Use default session settings unless the task requires an account-supported override, and scope cleanup to sessions created for the task.
• Distinguish installation and API diagnostics from skill loading and task completion.
• Add generic evaluation coverage for executable lookup and default session settings.

Scope

Documentation and evaluation prompts only. No CLI implementation, authentication mechanism, or client-specific permission changes.

Validation

• node scripts/validate-skills.mjs — 5 skills validated.
• git diff --check — passed.
• Updated evaluation prompts have been structurally validated; this PR does not claim new live behavior validation.