fix(release): keep floating tags and script version current

[NWarila]

Summary

• Stamp the released tag into .github/scripts/.version during release and backfill the marker to v1.0.6.
• Create the immutable release tag from the stamped commit, then force-update lightweight vX and vX.Y floating tags to that release commit.
• Add a stdlib-only release drift guard in CI for the .version marker, v1 target, and reusable workflow workflow_call triggers.

Root Cause

The floating v1 tag stopped advancing after v1.0.1, so consumers pinned to @v1 kept loading older reusable workflows even after later v1.0.x releases. The scripts version marker also drifted behind the published release, so sync state could not be trusted.

Validation

• python tools/check_release_drift.py
• .venv\Scripts\python.exe -m pytest tests/test_check_release_drift.py --no-cov
• .venv\Scripts\ruff.exe check tools\check_release_drift.py tests\test_check_release_drift.py
• .venv\Scripts\python.exe scripts\qa.py (6/6 checks, 116 tests)
• C:\Users\hellbomb\AppData\Local\Microsoft\WinGet\Links\actionlint.exe -color=false