use llama runner for qwen3 (#12556)

use llama runner for qwen3 (#12556)

logs: quiet down context canceled on completion and scheduler noise (#…
…12553)
* logs: quiet down context canceled on completion
If the client closes the connection before Completion finishes, we were
logging at error level implying the runner crashed which was misleading.
time=2025-10-08T22:59:20.566-07:00 level=ERROR source=server.go:1490 msg="post predict" error="Post \"https://127.0.0.1:57736/completion\": context canceled"
* quiet down scheduler log error on expected case
Since we don't hold the lock while performing memory load calculations, other
runners can unload in parallel, so finding no runner to unload is a valid scenario
which we shouldn't log at error level.

routes: structured outputs for gpt-oss (#12460)

CI: fix win arm build (#12502)
Resolve subtle erroraction stickiness difference between x86 and arm builder setup

CI: replace clang compiler for windows (#12495)

ci: place rocm windows in correct runner dir (#12487)

CI: temporarily disable clang install (#12486)
This will likely yield builds that have problems with unicode characters
but at least we can start testing the release while we try to find an
alternate clang compiler for windows, or mingw ships a fixed version.

ci: fix windows build (#12485)

ci: fix windows build (#12484)