Replaces the misc/build.func bootstrap with the two-root core loader.
No other change: the engine contract (var_*, update_script, start,
build_container, description) is identical on both engines.
versitygw.sh additionally gains a trailing newline; it lacked one.
With this batch every ct/ script is on the core engine.
Add optional tag prefix filtering to GitHub/GitLab release helpers and use web-v2 for Storyteller install/update so latest non-web tags no longer break deployment.
Enable Corepack and run Storyteller install/build commands through corepack yarn so the script honors upstream packageManager and avoids Yarn 1 failures.
