fix(skills-sh): tighten returned data reuse guidance

[Ray-56]

Summary

• Clarifies that the skills.sh CALL-E skill may only reuse structured run_id values across commands.
• Treats all other returned identifiers and text fields as display-only data.
• Keeps the command reference synchronized with the main skill guidance.

Context

This is a small real skill content update intended to change the public skills.sh skill hash and give skills.sh another opportunity to re-index / re-audit the calle skill after the stale Snyk audit tracked in vercel-labs/skills#1273.

Validation

• pnpm --filter @call-e/skills-sh-skill check
• pnpm check
• pnpm test
• pnpm pack:dry-run
• npx -y skills-ref validate ./skills/calle
• npx -y skills add ./skills/calle --list

Release decision

No release needed. This changes the root skills.sh public skill source only; no published npm package behavior or package contents are changed.