distribution-factory.ts was constructing AdoptDistribution for adopt/adopt-hotspot without passing a TemurinDistribution, leaving it to AdoptDistribution's internal constructor fallback. This makes the Temurin wiring implicit and untested at the factory level.

Changes:

• src/distributions/distribution-factory.ts — explicitly pass new TemurinDistribution(installerOptions, TemurinImplementation.Hotspot) to AdoptDistribution for adopt and adopt-hotspot cases:

  case JavaDistribution.Adopt:
  case JavaDistribution.AdoptHotspot:
    return new AdoptDistribution(
      installerOptions,
      AdoptImplementation.Hotspot,
      new TemurinDistribution(installerOptions, TemurinImplementation.Hotspot)
    );

• __tests__/distributors/distribution-factory.test.ts (new) — factory tests covering correct instance types for all distributions, and specifically asserting that adopt/adopt-hotspot wire in a TemurinDistribution with Hotspot, while adopt-openj9 does not.

Description:
The factory now owns the responsibility of composing AdoptDistribution with TemurinDistribution, rather than delegating that silently to the inner constructor.

Related issue:
N/A

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.