fix: MCP error because types are not enforced.

[another-rex]

TODO: Add integration tests to MCP to confirm functionality stays the same.

Fixes #2421

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.78%. Comparing base (0dd3348) to head (aa707f4).

Files with missing lines	Patch %	Lines
cmd/osv-scanner/mcp/command.go	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2422      +/-   ##
==========================================
- Coverage   67.81%   67.78%   -0.04%     
==========================================
  Files         172      172              
  Lines       13284    13291       +7     
==========================================
  Hits         9009     9009              
- Misses       3569     3576       +7     
  Partials      706      706              

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