Phase-A.1 implementation per
sporel-meta/docs/superpowers/specs/2026-06-09-phase-A-...
Template-Only-Subset; slots/container/quality/condition produce
loud-errors with explicit re-entry-phase hints. Position-Format
revised to two flat scalar properties (position.x, position.y) per
engine reality: no PROPERTY_TABLE exists.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
