[tools] Update schemas to not fail upon parsing

[mattpodwysocki]

Description

This PR improves the resilience of output schema validation across all tools by implementing
graceful fallback handling when API responses don't match expected schemas.

Changes

1. Fixed brand_id schema validation error in SearchAndGeocodeTool

• Changed brand_id from z.string() to z.union([z.string(), z.array(z.string())]) in
  SearchAndGeocodeTool.output.schema.ts:99
• The Mapbox API sometimes returns brand_id as an array instead of a single string, causing
  validation errors
• The union type now handles both formats gracefully

2. Added standardized graceful validation fallback to BaseTool

• Added validateOutput<T>() helper method to BaseTool (src/tools/BaseTool.ts:97-112)
• When output schema validation fails, the method:
  • Logs a warning with details about the validation failure
  • Returns the raw API data instead of throwing an error
• This ensures tools remain functional even when API responses change or schemas are incomplete

3. Updated VersionTool to use graceful validation

• Replaced hard-fail validation with the new validateOutput() helper method
• VersionTool now logs warnings instead of returning errors when validation fails
• Ensures version information is always available even if the schema changes

Benefits

• Improved resilience: Tools continue working when APIs return unexpected but valid data
• Better debugging: Validation failures are logged as warnings, making it easier to identify
  schema mismatches
• Consistent behavior: All tools now handle validation failures uniformly via BaseTool
• User experience: Clients receive data even when schemas don't match perfectly, preventing
  hard failures

Testing

Unit Tests Added:

1. BaseTool validation tests (test/tools/BaseTool.test.ts):

   • ✅ Returns validated data when schema validation succeeds
   • ✅ Returns raw data and logs warning when validation fails
   • ✅ Handles missing output schemas gracefully
   • ✅ Handles array data with validation failures

2. SearchAndGeocodeTool brand_id tests
   (test/tools/search-and-geocode-tool/SearchAndGeocodeTool.output.schema.test.ts:319-375):

   • ✅ Validates brand_id as a string (e.g., "starbucks-123")
   • ✅ Validates brand_id as an array of strings (e.g., ["brand-a-123", "brand-b-456"])

Test Results:

• All 365 tests pass across 31 test files
• No regressions introduced
• Build succeeds without errors

Manual Verification:
The original error from the Search and Geocode tool:
MCP error -32602: Output validation error: Invalid structured content for tool
search_and_geocode_tool: Expected string, received array at path features[4].properties.brand_id
is now resolved - the tool accepts both string and array formats for brand_id.

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Checklist

• Code has been tested locally
• Unit tests have been added or updated
• Documentation has been updated if needed

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Additional Notes