docs: refresh skills repository documentation

[Chkhikvadze]

Summary

• refresh the repo README with a status snapshot, command matrix, and verification shortcuts
• expand docs/features.md and docs/architecture.md with consistency and operational notes grounded in the current wrappers
• tighten docs/known-issues.md with severity markers and a repo-level issue snapshot

Verification

• git diff --stat HEAD -- README.md docs/features.md docs/architecture.md docs/known-issues.md
• git log --oneline -3
• grep verification for inserted headings/keywords in all required docs files

[Chkhikvadze]

Maintainer sweep: this is blocked on merge conflicts with main (GitHub reports CONFLICTING/DIRTY). Please rebase or merge main into this branch, resolve the conflicts, and push an updated head so it can be reviewed cleanly.