feat(cli): extract Obelisk runtime into npm package

Add @obelisk-apps/cli with the existing build, search, query, and attune contract plus official skill installation.

Separate the docs-only skill artifact, bootstrap installer, release layout, cross-platform CI, and package-level regression coverage.

packaging/publish-skill.sh

@@ -5,7 +5,7 @@ SKILL_ARTIFACT="dist/obelisk-skill"
 SKILL_REPO="dist/obelisk-skill-repo"
 REMOTE="git@github.com:tommy0103/obelisk-skill.git"
 
-if [ ! -d "$SKILL_ARTIFACT/scripts" ]; then
+if [ ! -f "$SKILL_ARTIFACT/SKILL.md" ] || [ ! -d "$SKILL_ARTIFACT/references" ]; then
   echo "Error: run 'npm run build:skill' first" >&2
   exit 1
 fi