Fix execution log download URL handling

[cursor]

Description

Fixes a critical breakage in the execution_log URL-only path:

• Exposes return_download_url in the public harness_get input schema so schema-driven MCP clients can use the opt-in instead of falling back to buffered log retrieval.
• Makes resolveLogDownloadUrl() fail fast for Harness log-service blob links that require MCP server auth/proxying, rather than returning a URL that callers cannot fetch directly.
• Adds focused regressions for the public schema/handler path and non-exportable Harness blob links.

Type of Change

• Bug fix
• New feature
• Refactor
• Documentation
• Other

Checklist

• Tests pass
• Typecheck passes

Validation:

• pnpm build
• pnpm docs:generate
• pnpm docs:check
• pnpm typecheck
• pnpm exec vitest run tests/utils/log-resolver.test.ts tests/tools/tool-handlers.test.ts -t 'resolveLogDownloadUrl|return_download_url'
• pnpm test

  

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