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/stage-skill-repo.sh

@@ -15,7 +15,7 @@ if [ "$TARGET_DIR" = "/" ] || [ "$TARGET_DIR" = "." ] || [ "$TARGET_DIR" = "$ROO
   exit 1
 fi
 
-for required in SKILL.md package.json references scripts; do
+for required in SKILL.md package.json references; do
   if [ ! -e "$ARTIFACT_DIR/$required" ]; then
     echo "Error: skill artifact missing $required at $ARTIFACT_DIR" >&2
     exit 1