Add prompt-first TinyFish integration for DeepSeek Harness

[pranavjana]

Summary

• add a copy-paste coding-agent prompt that builds TinyFish Search and Fetch as local native DeepSeek Harness providers
• require current-interface inspection, credential safety, mocked contracts, live TinyFish tool calls, isolated profile installation, and a Web UI smoke test
• document the architecture and add the recipe to the root DeepSeek Harness and Developer Tools sections
• keep distribution local: no npm publication or Harness fork required

Validation

• git diff --check
• balanced Markdown code fences
• all referenced official links return HTTP 200
• prompt requirements derived from a locally exercised DSH provider path, including live web_search, live web_fetch, clean-profile Bundle installation, composed-config inspection, and Web UI HTTP 200

Scope

This recipe covers TinyFish Search and Fetch only. Agent and Browser automation remain available through TinyFish MCP and SDK integrations.

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[simantak-dabhade]

LGTM