idea : make the documented skill install version-matched to the binary

[mansiverma897993]

idea / problem

npx skills add herdrdev/herdr --skill herdr -g installs the SKILL.md from master, which documents behavior that may not exist in the user's installed stable release. Right now a stable v0.8.0 user gets a skill describing the agent_blocked behavior from #2788, which only exists on master. An agent can end up acting on instructions the installed binary doesn't actually support.

requested change

Suggested approach: have the docs install the skill from the tag matching the installed version (herdrdev/herdr@v0.8.0, derived from herdr --version), and verify the installed file against herdr --skill (the release-matched bundled copy). The unpinned master form stays only for master-built/preview binaries.

why you want this

I have a candidate docs draft on a branch: https://github.com/mansiverma897993/herdr/tree/fix/issue-2847-skill-version-match

Happy to adjust the approach this is only a starting point, not a PR.