15-task implementation plan derived from the design spec at
docs/superpowers/specs/2026-05-06-lift-drill-into-evals-design.md.
Each task is bite-sized (2-5 min steps) with exact commands, exact
file paths, and exact code where required. Subagent verification
gates per the spec are written out as concrete prompt templates.
Self-review:
- Spec coverage: every spec section maps to a task
- Placeholder scan: no TBD/TODO/placeholder/fill-in-later language
- Type consistency: helper named _set_superpowers_root_default
consistently; drill SHA recorded in evals/.drill-source-sha
consistently