sloproxy

fix(codex): make input ID sanitization collision-resistant and deterministic master

- Track normalized ID state (`occupied`/`preserved`) during preprocessing to avoid remapping valid existing IDs. - Resolve collisions by appending deterministic hash-based suffixes until a free ID is found. - Share occupancy tracking across shortening and remapping so sanitized IDs remain stable and idempotent. Closes: #4891


+135 -6
2 changed files