fix(opencode): sanitize unknown MCP schema formats before jsonSchema() - #20747

Hey! Your PR title sanitize unknown MCP schema formats before jsonSchema() doesn't follow conventional commit format.

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Linked issue added: Fixes #20749.

For CI context: the remaining failing check is unit (linux), and its log points to test/memory/abort-leak.test.ts (memory: abort controller leak > webfetch does not leak memory over many invocations). This appears unrelated to the MCP schema-format sanitizer changes in this PR.

I ran the targeted checks locally on this branch:

• bun test test/mcp/schema.test.ts
• bun run typecheck
• bun run build
• bun test test/memory/abort-leak.test.ts (passes locally)

This pull request has been automatically closed because it was not updated to meet our contributing guidelines within the 2-hour window.

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