Critical fixes:
- Complete rename cloudflare_temp_email → cloudflare-temp-email in git tree
(previous commit had .gitmodules updated but tree still pointed to old path)
- Remove duplicate/stale cloudflare_temp_email entry from .gitmodules
- Re-add missing submodule packages/general/mregister (was lost during rename)
- Re-add missing submodule packages/codex/codex-register (was lost during rename)
- Fix exa-free pinned commit mismatch (tree vs local HEAD)
- Remove stray untracked cloudflare_temp_email/ directory from repo root
All 19 submodules now verified: git tree, .gitmodules, and filesystem are
fully consistent. git clone --recurse-submodules should work cleanly.