Consolidate CI release artifact publishing

Add a reusable release workflow for publishing build artifacts from the
top-level and per-platform CMake workflows. Standardize artifact upload,
release tag selection, dependency summaries, and stale-release checks across
macOS, Ubuntu, Windows, and Windows on ARM builds.

Move shared build helper files under tools, add Windows scripts for fetching
and verifying current SQLite/OpenSSL downloads, and let Dependabot track the
new Python helper requirements.

Update CTest registrations to run the generated test executables directly.