Add update method to People resource

[ebrett]

Summary

• Implements People.update() method for modifying person/signup data
• Uses V2 API endpoint PATCH /api/v2/signups/:id with JSON:API format
• Adds comprehensive test coverage for success, error cases, and edge cases

Changes

Implementation (lib/nationbuilder_api/resources/people.rb)

• Added update(id, attributes:) method
• Accepts person ID and attributes hash
• Handles nested structures (e.g., addresses)
• Proper JSON:API request formatting
• Full RDoc documentation with examples

Tests (spec/nationbuilder_api/resources/people_spec.rb)

• Success case: basic field updates
• Success case: nested address updates
• Edge case: empty attributes hash
• Edge case: string vs integer IDs
• Error handling: 404 NotFoundError
• Error handling: 422 ValidationError
• Error handling: 401 AuthenticationError

Test Results

• ✅ All 186 tests passing
• ✅ Coverage: 92.51% (above 90% threshold)
• ✅ StandardRB linting passed

Usage Example

# Update basic fields
client.people.update(123, attributes: {
  first_name: "John",
  last_name: "Doe",
  email: "john@example.com",
  mobile: "+1234567890"
})

# Update address
client.people.update(123, attributes: {
  primary_address: {
    address1: "123 Main St",
    city: "Portland",
    state: "OR",
    zip: "97201",
    country_code: "US"
  }
})

Related Issues

• Closes nb-0a4
• Partial implementation of nb-7 (People Resource - Full CRUD)

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