Teach kb-builder CLI and API source modes

[giaphutran12]

Summary

• switch kb-builder guidance from Agent-first to TinyFish Search/Fetch-first
• add CLI/API/auto source mode rules, honoring explicit user preference
• document execution-only env loading for API keys without inspecting secrets
• keep Agent as fallback for blocked, dynamic, or unreadable pages

Verification

• tinyfish CLI updated locally to 0.1.6
• tinyfish search query "TinyFish docs" passed
• tinyfish fetch content get --format json --links https://docs.tinyfish.ai passed
• API Search passed using approved execution-only env load
• API Fetch passed using approved execution-only env load
• git diff --check passed
• npm run build blocked: root package.json is absent in this repo

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