Ralph init

Scaffold repo-local Ralph harness. Opt-in only.

Rules

• Only create/update scripts/ralph/ in the current repo.
• If scripts/ralph/ already exists, offer to update (preserves config.env).
• Copy templates from .opencode/skill/flow-next-opencode-ralph-init/templates/ into scripts/ralph/.
• Copy flowctl and flowctl.py from $OPENCODE_DIR/bin/ into scripts/ralph/.
• Set executable bit on scripts/ralph/ralph.sh, scripts/ralph/ralph_once.sh, and scripts/ralph/flowctl.

Workflow