feat(mcp): add Parallel Search MCP

[georgeatparallel]

Summary

• Add one source-backed MCP entry with anonymous setup, live web search, URL fetching, and clear safety and privacy notes.
• Use the canonical endpoint and official documentation, with both source links checked on 2026-08-22.
• Omit the optional repository URL because this hosted service does not have a public source repository.
• Include explicit vendor affiliation in the entry.

Validation

• pnpm validate:content:strict passed for 1,389 content files. The 24 reported warnings belong to existing entries.
• git diff --check passed.
• Confirmed the endpoint initializes anonymously and exposes web_search and web_fetch.
• Changed exactly one source content file, with no generated files or package artifacts.

Notes

No linked issue: this is a focused direct-content submission under the documented contribution policy.

Disclosure: I work at Parallel.ai, which operates this hosted MCP endpoint.