Handle lazy IO property allocation failures

[alistanis]

• I confirm that I am the author of this code and release it to the SDL project under the zlib license. This contribution does not contain code from other sources, including code generated by a Large Language Model ("AI").

Only publish stream property groups after all initializer calls succeed. Destroy incomplete groups and allow retry so failed property insertion cannot orphan a dynamic stream's existing buffer.

Add an isolated allocation failure regression covering close, retry, and explicit ownership transfer.

Description

This change prevents failed property initialization from publishing incomplete properties and leaking a stream’s buffer, that's pretty much it.

Existing Issue(s)

None, but can create one if necessary.

Thanks,
Chris

[slouken]

This change seems fine to me, although have you seen our AI policy?
https://github.com/libsdl-org/SDL/blob/main/AGENTS.md

Please remove the test program and go ahead and add additional tests to test/testautomation_iostream.c if they are warranted.

[icculus]

Yeah, that test program is...pretty aggressive.

Emphasis on "if they are warranted," which they likely are not for this PR.

[alistanis]

Yes I've seen the policy; I work at Nasuni as a Principal SWE and these are the kinds of tests we write for our filesystem. I work on the backend data path team and we try to be very thorough; I have no problem dialing it back

[alistanis]

Removed the tests, thanks for the feedback; I'll try not to be so aggressive next time or I'll draft and reach out asking what you'd like.

[alistanis]

Forgot to remove the CMake entry...

[alistanis]

Rebased and removed the CMakeLists entry; please let me know if you'd like anything else.

[slouken]

Merged, thanks!

[alistanis]

Thanks Sam, and for what it's worth, thank you for all you've done. I've been working with SDL for a while on my personal projects, and I really appreciate it.

[slouken]

You're welcome! :)