fix(tool-calls): preserve query-bearing MCP names

[dawNotPoi]

Fixes #710

Summary

• Stop treating every MCP payload with a query field as a web search.
• Keep the explicit tool name for OpenCode MCP calls such as codegraph_explore.
• Continue recognizing query-bearing calls when the title or kind identifies websearch.

Tests

• ./node_modules/.bin/vitest run src/lib/tool-call-normalization.test.ts --reporter=dot
• ./node_modules/.bin/eslint src/lib/tool-call-normalization.ts src/lib/tool-call-normalization.test.ts
• git diff --check
• Full Vitest: 6332 passed; one pre-existing forge-page.test.tsx timeout.

[xintaofei]

codeg work task 184 is done — #729 (2 files, +76/-3).