Update peer fleet setup guidance

[jack-champagne]

Summary

• Recommend peer studios for resilient multi-machine fleets and describe near-real-time session and prompt sync accurately.
• Recommend Tailscale for cross-network connectivity, link its install guide, and prohibit router port-forwarding or public exposure.
• Update fleet troubleshooting and the peer architecture README to remove stale claims about peer session sharing.

Verification

• node scripts/lint-skills.mjs --known scripts/lint-skills-known.txt from packages/extension (0 errors; existing warnings remain)
• git diff --check

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