Hoist the sandbox-directory sanitizer into tools/environments/base.py as
sanitize_task_id_for_path() and route BOTH host-path consumers through it:
the docker persistent sandbox (get_sandbox_dir()/docker/<id>) and the
singularity persistent overlay (hermes-overlays/overlay-<id>). One helper,
one mapping, whole bug class fixed in one place instead of per-backend
copies (#92414, #92640, #93044).
docker.py keeps _sandbox_dir_name as an alias of the shared helper so the
sanitized mapping (safe ids verbatim, digest suffix on rewrite for
collision safety) is unchanged for existing sandboxes.
Co-authored-by: salch-cred <salch-cred@users.noreply.github.com>
Co-authored-by: Parker Fawcett <259203091+Parker-Fawcett@users.noreply.github.com>
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