Add an SPI `Attachment.uncheckedPreferredName` property. #239

Job	Run time
Test / macOS (Xcode 26.0 - sequoia - ARM64)	3m 1s
Test / iOS (Build Only, Xcode 26.0 - sequoia - ARM64)	3m 0s
Test / Linux (nightly-main - amazonlinux2)	5m 35s
Test / Linux (nightly-main - jammy)	4m 59s
Test / Linux (nightly-6.2 - jammy)	5m 7s
Test / Linux (nightly-6.2 - amazonlinux2)	6m 16s
Test / Static Linux Swift SDK Build (${{ matrix.swift_version }} - ${{ matrix.os_version }})	0s
Test / Swift SDK for Wasm Build (6.2 - amazonlinux2)	2m 43s
Test / Swift SDK for Wasm Build (nightly-6.2 - jammy)	3m 25s
Test / Swift SDK for Wasm Build (nightly-6.2 - amazonlinux2)	6m 9s
Test / Swift SDK for Wasm Build (6.2 - jammy)	2m 41s
Test / Swift SDK for Wasm Build (nightly-main - jammy)	3m 9s
Test / Swift SDK for Wasm Build (nightly-main - amazonlinux2)	3m 52s
Test / Windows (nightly-main - windows-2022)	17m 33s
Test / Windows (nightly-6.2 - windows-2022)	16m 9s
Test / Swift SDK for Android Build (${{ matrix.swift_version }} - ${{ matrix.os_version }})	0s
Test / Embedded Swift SDK for Wasm Build (${{ matrix.swift_version }} - ${{ matrix.os_version }})	0s
Soundness / YAML lint check	4s
Soundness / Shell check	57s
Soundness / Unacceptable language check	5s
Soundness / Documentation check	0s
Soundness / Broken symlinks check	6s
Soundness / License headers check	7s
Soundness / Python lint check	7s
Soundness / Format check	0s
Soundness / API breakage check	0s
	1h 25m 5s

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