update-gaialisted

Pull the latest GAIA release into this project without clobbering customizations. Does a three-way comparison per file (adopter / baseline / latest) and respects explicit classes in `.gaia/manifest.json`: - **`owned`**: GAIA controls fully. Overwrites silently if unchanged from baseline; prompts if drifted. - **`shared`**: GAIA seeds, you customize. Emits a `.gaia-merge/` patch for manual resolution on drift. - **`wiki-owned`**: GAIA-seeded concept/decision/module wiki pages. Same drift handling as `shared`. - **adopter-owned (implicit)**: anything not in the manifest, plus sentinels like `wiki/hot.md`, `wiki/log.md`, `CHANGELOG.md`, `.gaia/VERSION`, `.gaia/manifest.json`. Never touched. Backups land in `.gaia-backup/<timestamp>/`. Conflict patches land in `.gaia-merge/`. ## Pre-flight: Worktree check This wrapper changes `.gaia/VERSION` and opens a PR, both belong on the main checkout, not a per-SPEC worktree branch. If invoked from a linked worktree, reject hard with a message that surfaces the cached version state from main so the user knows whether a GAIA update is even pending. Detection (run this first, before anything else): ```bash common_dir="$(git rev-parse --git-common-dir 2>/dev/null)" if [ -n "$common_dir" ]; then case "$common_dir" in /*) absolute_common_dir="$common_dir" ;; *) absolute_common_dir="$(pwd)/$common_dir" ;; esac main_root="$(cd "$(dirname "$absolute_common_dir")" 2>/dev/null && pwd)" current_root="$(git rev-parse --show-tople