flow-next-ralph-init

# Ralph init Scaffold or update repo-local Ralph harness. Opt-in only. ## Preamble The plugin root resolves once via the cross-platform env-var fallback (Droid uses `DROID_PLUGIN_ROOT`; Claude Code documents `CLAUDE_PLUGIN_ROOT` as its compat alias). Subsequent blocks use `$PLUGIN_ROOT`: ```bash PLUGIN_ROOT="${DROID_PLUGIN_ROOT:-${CLAUDE_PLUGIN_ROOT}}" ``` ## Rules - Only create/update `scripts/ralph/` in the current repo. - If `scripts/ralph/` already exists, offer to update (preserves config.env). - Copy templates from `templates/` into `scripts/ralph/`. - Copy `flowctl` and `flowctl.py` from `$PLUGIN_ROOT/scripts/` into `scripts/ralph/`. - Set executable bit on `scripts/ralph/ralph.sh`, `scripts/ralph/ralph_once.sh`, and `scripts/ralph/flowctl`. ## Workflow 1. Resolve repo root: `git rev-parse --show-toplevel` 2. Check if `scripts/ralph/` exists: - If exists: ask "Update existing Ralph setup? (preserves config.env and runs/) [y/n]" - If no: stop - If yes: set UPDATE_MODE=1 - If not exists: set UPDATE_MODE=0 3. Detect available review backends (skip if UPDATE_MODE=1): ```bash HAVE_RP=$(which rp-cli >/dev/null 2>&1 && echo 1 || echo 0) HAVE_CODEX=$(which codex >/dev/null 2>&1 && echo 1 || echo 0) HAVE_COPILOT=$(which copilot >/dev/null 2>&1 && echo 1 || echo 0) ``` 4. Determine review backend (skip if UPDATE_MODE=1): - If MULTIPLE available, ask user (do NOT use AskUserQuestion tool). Only show the options whose CLIs were det...