docs: start Cookbook recipes with Agent setup

[FakeHank]

Summary

• start every Recipe's copied Agent instruction from the canonical /agent-setup connection entry
• preserve the original research task and continue it after authorization without asking for an API Key
• clarify that users may need to complete client Trust, login, Beta access, and authorization
• define /agent-setup as the connection entry and /docs/agent as the capability-documentation entry without conflicting link rules

Validation

• node scripts/check-recipes.mjs
• git diff --check

Review follow-up

This branch includes both P2 review fixes: the missing Trust action and the conflicting allowed-link rules.

[FakeHank]

This standalone repository has now been retired in #6. Maintained research methods live in Asklear Agent Docs, and public examples live in Asklear Research, so this earlier setup-focused PR is no longer needed.