Add GetPointOwnership function for comprehensive ownership queries

- Add PointOwnership struct with Owner, IsActive, HasSponsor, Sponsor fields
- Implement GetPointOwnership function using GraphQL queries to azimuth-watcher
- Use "latest" block hash for efficiency
- Properly handle sponsor detection using HasSponsor query
- Support galaxy ~zod (point 0) as valid sponsor

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

client.go

@@ -66,6 +66,14 @@ type CachedKey struct {
 	ExpiresAt time.Time
 }
 
+// PointOwnership represents point ownership information from Azimuth
+type PointOwnership struct {
+	Owner     string `json:"owner"`
+	IsActive  bool   `json:"is_active"`
+	HasSponsor bool  `json:"has_sponsor"`
+	Sponsor   uint32 `json:"sponsor,omitempty"`
+}
+
 // NewClient creates a new Azimuth client with default configuration
 func NewClient(endpoint string) *Client {
 	return NewClientWithOptions(ClientOptions{
@@ -296,6 +304,49 @@ func (c *Client) GetOwner(ctx context.Context, point uint32) (string, error) {
 	return resp.AzimuthGetOwner.Value, nil
 }
 
+// GetPointOwnership retrieves comprehensive ownership information for a point
+func (c *Client) GetPointOwnership(ctx context.Context, point uint32) (*PointOwnership, error) {
+	// Convert point to BigInt
+	pointBigInt := NewBigIntFromUint32(point)
+
+	// Query for owner using "latest" block
+	ownerResp, err := GetOwner(ctx, c.gqlClient, "latest", c.contractAddress, pointBigInt)
+	if err != nil {
+		return nil, fmt.Errorf("failed to query owner: %w", err)
+	}
+
+	// Query for active status
+	activeResp, err := IsActive(ctx, c.gqlClient, "latest", c.contractAddress, pointBigInt)
+	if err != nil {
+		return nil, fmt.Errorf("failed to query active status: %w", err)
+	}
+
+	// Query for sponsor status using HasSponsor
+	hasSponsorResp, err := HasSponsor(ctx, c.gqlClient, "latest", c.contractAddress, pointBigInt)
+	if err != nil {
+		return nil, fmt.Errorf("failed to query sponsor status: %w", err)
+	}
+
+	// Query for sponsor point number
+	sponsorPoint := uint32(0)
+	if hasSponsorResp.AzimuthHasSponsor.Value {
+		sponsorResp, err := GetSponsor(ctx, c.gqlClient, pointBigInt, "latest", c.contractAddress)
+		if err != nil {
+			return nil, fmt.Errorf("failed to query sponsor: %w", err)
+		}
+		if parsed, err := strconv.ParseUint(sponsorResp.AzimuthGetSponsor.Value, 10, 32); err == nil {
+			sponsorPoint = uint32(parsed)
+		}
+	}
+
+	return &PointOwnership{
+		Owner:      ownerResp.AzimuthGetOwner.Value,
+		IsActive:   activeResp.AzimuthIsActive.Value,
+		HasSponsor: hasSponsorResp.AzimuthHasSponsor.Value,
+		Sponsor:    sponsorPoint,
+	}, nil
+}
+
 // getShipKeys retrieves all keys for a ship from the API
 func (c *Client) getShipKeys(ctx context.Context, point uint32) (*ShipKeys, error) {
 	// Get current block hash