Fix GeoJSON MultiLineString coordinates being flattened

[michaelstaib]

• fix GeoJsonMultiLineStringType to resolve coordinates from geometry collection members instead of MultiLineString.Coordinates
• preserve each contained LineString boundary in GraphQL output ([[Position]] instead of flattened [Position])
• update multiline type snapshots to lock the corrected output and schema shape

Fixes #5352

[github-actions]

Fusion Gateway Performance Results

Simple Composite Query

	Req/s	Err%
Constant 2 (50 VUs)	3052.16	0.00%
Ramping 2 (0-500-0 VUs)	3846.91	0.00%

Response Times

	Min	Med	Avg	P90	P95	Max
Constant 2	1.18ms	13.24ms	16.07ms	26.10ms	36.02ms	268.09ms
Ramping 2	1.25ms	52.77ms	57.02ms	98.56ms	140.22ms	296.53ms

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Deep Recursion Query

	Req/s	Err%
Constant 2 (50 VUs)	684.64	0.00%
Ramping 2 (0-500-0 VUs)	816.24	0.00%

Response Times

	Min	Med	Avg	P90	P95	Max
Constant 2	11.31ms	63.54ms	70.45ms	90.00ms	110.30ms	809.48ms
Ramping 2	2.94ms	224.56ms	253.66ms	533.35ms	594.68ms	1004.25ms

---

Variable Batching Throughput

	Req/s	Err%
Constant 2 (50 VUs)	6072.15	0.00%
Ramping 2 (0-500-0 VUs)	6021.71	0.00%

Response Times

	Min	Med	Avg	P90	P95	Max
Constant 2	0.14ms	7.69ms	8.14ms	13.47ms	16.59ms	53.37ms
Ramping 2	0.15ms	34.34ms	38.16ms	68.07ms	98.18ms	217.81ms

---

Runner 2 = benchmarking-2

Run 22417076776 • Commit a88197d • Wed, 25 Feb 2026 22:44:14 GMT