One-off, idempotent script that splits issue S-00 (#1) into sub-slices
S-00-a..e per CLAUDE.md §13: creates the five sub-slice issues under the
Iteration 0 milestone, then closes#1 with a comment listing the
replacements. Driven by curl/jq; reads GITEA_TOKEN from the environment.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>