chore: sync non-stub changes from base branch (110 commits)

Applies configuration, workflow, and implementation file updates
from base branch autoloop/build-tsikit-learn-scikit-learn-typescript-migration.
Stub-only files (ext*.ts) are excluded as they don't affect this review PR.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: github-actions[bot]