Add coverage for ssh, npm test, git checkout/merge/rebase, vercel, nslookup, gh workflow

Context

Ran rtk discover -a against ~24 Claude Code sessions (1522 Bash commands) and found a set of frequently-used commands that don't yet have RTK equivalents. Sharing in case they're useful additions.

Unhandled commands (by frequency)

Command	Count in sample	Example
ssh	41	ssh -i ~/.ssh/id_ed25519 -o ConnectTimeout=... user@host '...'
git checkout	22	git checkout main
npm test	14	npm test --silent
python (direct invocation)	12	python -m pyright app/routers/...
git merge	7	git merge --no-ff <branch>
git ls-files	5	git ls-files --error-unmatch <path>
npm install	4	npm install --silent
git rebase	4	git rebase origin/main
nslookup	3	nslookup -type=TXT <host>
vercel ls	3	vercel ls
gh workflow	3	gh workflow list
terraform version	2

Why these matter

In our context (Brazilian fiscal-validation platform, deploy to Magalu Cloud via SSH + Vercel for frontend):

• ssh is the highest-value miss — long deploy/log output from remote VMs is exactly the kind of payload RTK already handles well for curl.
• npm test / npm install would slot naturally alongside the existing rtk npm run coverage.
• git checkout/merge/rebase/ls-files would complete the rtk git family (already covers push, status, commit, stash pop).
• vercel ls and gh workflow produce verbose tabular output similar to already-covered gh pr and gh run list.

Environment

• rtk 0.39.0 on Windows 11 (Git Bash)
• Hook configured globally via PreToolUse → Bash → rtk hook claude

Happy to provide more sample outputs or run additional rtk discover slices if useful.