Adds .agents/skills/data-driven-design: general mechanisms in code, all specific knowledge in data. Written for the long-term cleanup that would let sow-tools be open sourced.
Grounded in two real failures: the value_encodings mode zoo (per-column mode enums + switch arms where a shape/encoding declaration in data would do) and the skills dataset rename (code hardcoding dataset names/key prefixes that the data already knows).
Tested per TDD-for-skills: a baseline subagent given the EquipSlots scenario added a fourth mode and rationalized it ("three switch cases isn't a pattern crisis"); with the skill loaded it declared shape in data, collapsed the modes into orthogonal primitives, and deleted the switch.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Reviewed-on: #44
Co-authored-by: vickydotbat <vickydotbat@tutamail.com>
Co-committed-by: vickydotbat <vickydotbat@tutamail.com>