fix: stabilize live session UI and skill publishing

Keep message navigation and progress state synchronized, and preserve
sequential split-flap count updates with a bounded queue.

Publish the Obelisk skill under skills/obelisk for npx skills, sharing
the same staging layout between CI and local releases with regression coverage.

packaging/publish-skill.sh

@@ -1,18 +1,18 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-SKILL_DIR="dist/obelisk-skill"
+SKILL_ARTIFACT="dist/obelisk-skill"
+SKILL_REPO="dist/obelisk-skill-repo"
 REMOTE="git@github.com:tommy0103/obelisk-skill.git"
 
-if [ ! -d "$SKILL_DIR/scripts" ]; then
+if [ ! -d "$SKILL_ARTIFACT/scripts" ]; then
   echo "Error: run 'npm run build:skill' first" >&2
   exit 1
 fi
 
-cp packaging/skill-README.md "$SKILL_DIR/README.md"
-cp packaging/skill-LICENSE "$SKILL_DIR/LICENSE"
+bash packaging/stage-skill-repo.sh "$SKILL_REPO" "$SKILL_ARTIFACT"
 
-cd "$SKILL_DIR"
+cd "$SKILL_REPO"
 rm -rf .git
 git init
 git remote add origin "$REMOTE"

packaging/stage-skill-repo.sh

@@ -0,0 +1,34 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+TARGET_DIR="${1:-}"
+ARTIFACT_DIR="${2:-$ROOT_DIR/dist/obelisk-skill}"
+
+if [ -z "$TARGET_DIR" ]; then
+  echo "Usage: packaging/stage-skill-repo.sh <target-repo> [skill-artifact]" >&2
+  exit 1
+fi
+
+if [ "$TARGET_DIR" = "/" ] || [ "$TARGET_DIR" = "." ] || [ "$TARGET_DIR" = "$ROOT_DIR" ]; then
+  echo "Error: refusing to replace unsafe target directory: $TARGET_DIR" >&2
+  exit 1
+fi
+
+for required in SKILL.md package.json references scripts; do
+  if [ ! -e "$ARTIFACT_DIR/$required" ]; then
+    echo "Error: skill artifact missing $required at $ARTIFACT_DIR" >&2
+    exit 1
+  fi
+done
+
+mkdir -p "$TARGET_DIR"
+find "$TARGET_DIR" -mindepth 1 \
+  ! -path "$TARGET_DIR/.git" \
+  ! -path "$TARGET_DIR/.git/*" \
+  -delete
+
+mkdir -p "$TARGET_DIR/skills/obelisk"
+cp -R "$ARTIFACT_DIR"/. "$TARGET_DIR/skills/obelisk/"
+cp "$ROOT_DIR/packaging/skill-README.md" "$TARGET_DIR/README.md"
+cp "$ROOT_DIR/packaging/skill-LICENSE" "$TARGET_DIR/LICENSE"