fix: align release Python 3.15 qualification with main #38

Failure

The v0.1.1 release workflow invokes the shared ecosystem qualification workflow without the prerelease-test-paths input used by .github/workflows/ecosystem.yml.

Release run 31556989949 therefore ran the entire test suite in the Python 3.15 core environment on Linux, macOS, and Windows. Collection failed because PyTorch is intentionally not installed in that hardware-independent prerelease environment. The same commit passed the required core-only Python 3.15 matrix on main.

Reproduction

1. Qualify commit 53ab233c7761601081f656b298aea7db338432bc on main: required Python 3.15 core paths pass on all three operating systems.
2. Push tag v0.1.1 at the same commit.
3. Observe release run 31556989949 collect all of tests/ and fail imports such as torch in all three Python 3.15 jobs.

Acceptance criteria

• The release workflow uses the same reviewed Python 3.15 core test paths as the PR and main ecosystem workflow.
• A regression check fails if the release and default-branch ecosystem callers diverge on this input.
• Full repository gates and the release-qualification matrix pass.
• The fix is published in a replacement patch release because the failed v0.1.1 tag is immutable.