chore(master): release execution 1.18.0

[wundergraph-bot]

🤖 I have created a release beep boop

1.18.0 (2026-08-13)

Features

• implement multi fetch to the same subgraph (#1594) (22584e2)
• improve abstract field validation (#1588) (d6cceac)
• schedule fetch trees optimally (#1612) (bd03deb)

Bug Fixes

• add planner edge case fixes (#1581) (165b1f5)
• incorrect alias behavior for required fields (#1604) (5752e91)
• incorrect type detection for abstract types (#1613) (e249e88)

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