chore(main): release 3.15.0

[github-actions]

Release components:

• unity-package: Unity Package Manager/OpenUPM package (v<version> tags).
• uloop-project-runner: native project runner binaries (uloop-project-runner-v<version> tags).
• dispatcher: native dispatcher binaries (dispatcher-v<version> tags).

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3.15.0 (2026-10-10)

Features

• Hot reload keeps one run's assemblies cached between runs, uloop compile returns at once without raising the Editor, and pause point timeouts report their own timeout (#3236) (68cdec1)

Performance Improvements

• Hot reload reads the assemblies its caller-note budget refused in the background, so the next run finds them cached (#3269) (7b8daca)
• Hot reload's lifecycle note reads at most one assembly the call-site cache does not hold yet, so a cold run no longer walks the callers' callers (#3268) (a6cb372)
• The first hot reload after a domain reload finds the transform worker started and its Roslyn paths compiled, and the source snapshotter is split behind one capture facade (#3266) (32297ac)

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