Prepare for beta 2

[oschwald]

• Replace IsZero with HasData methods
• Extract model structs to separate file
• Replace anonymous structs with named types
• Fix latitude/longitude pointer handling

[Copilot]

Pull Request Overview

This PR updates the API to replace the IsZero() methods with HasData() methods across result structs, extracts model structs to a separate file, replaces anonymous structs with named types, and fixes latitude/longitude pointer handling.

• Replaces IsZero() with HasData() to clarify data presence checks.
• Extracts model definitions and updates struct types for improved ergonomics.
• Adjusts coordinate handling by changing float64 fields to *float64 and adding HasCoordinates().

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
reader_test.go	Updates assertions to reflect new HasData() semantics and pointer handling for coordinates.
reader.go	Removes redundant conditional checks since Network/IPAddress fields are now always set.
models.go	Extracts model definitions with new named types and HasData() methods.
example_test.go	Updates examples to use HasData() and safe coordinate access.
README.md	Revises documentation to describe HasData() and coordinate handling changes.
CHANGELOG.md	Document breaking changes in API and type updates.

Comments suppressed due to low confidence (2)

reader.go:181

• Since the removal of the 'if result.Found()' block implies that IPAddress and Network fields are always set, please ensure that result.Prefix() returns a valid default when no data is found.

	enterprise.Traits.IPAddress = ipAddress

README.md:14

• Verify that the documentation clearly explains the new HasData() semantics compared to the old IsZero() behavior for accurate user understanding.

`IPAddress` fields to all result structs, and includes a `HasData()` method to

[Copilot]

Consider adding an explicit check using record.Location.HasCoordinates() before dereferencing Latitude and Longitude pointers to prevent potential nil pointer dereferences.

Suggested change

	assert.Equal(t, uint16(100), record.Location.AccuracyRadius)
	assert.Equal(t, uint16(100), record.Location.AccuracyRadius)
	if !record.Location.HasCoordinates() {
	t.Fatalf("Location does not have valid coordinates")
	}