feat: Implement Mattermost sync functionality and enhance workspace context management

scripts/mattermost/sync.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+
+if [[ -x "$SCRIPT_DIR/.venv/bin/python" ]]; then
+  PYTHON_BIN="$SCRIPT_DIR/.venv/bin/python"
+elif [[ -n "${PYTHON_BIN:-}" ]]; then
+  PYTHON_BIN="$PYTHON_BIN"
+else
+  PYTHON_BIN="python3"
+fi
+
+exec "$PYTHON_BIN" "$SCRIPT_DIR/mattermost_context.py"