Add Codex plugin manifest and setup skill

Release v5.4.9

Merge pull request #100 from ndycode/fix/issue-98-model-catalog-docs

Guard full template provider spreads

fix: harden full catalog installer safeguards

fix: unpin cached plugin without clearing cache

Merge branch 'main' into fix/issue-98-model-catalog-docs

fix: harden installer writes and test full mode

fix: address pr review follow-ups

fix: default installer to full model catalog

chore(release): cut v5.4.8

docs: clarify modern model preset catalog

Merge pull request #99 from sdip15fa/feature/deactivated-workspace-rotation

fix(pr99):restore-zero-removal-fallback

fix: drop deactivated refresh-token variants from rotation