HSDD Config: Phase-Scoped OpenSpec Context

Configure OpenSpec's config.yaml so every artifact inherits project context, invokes the right companion skills, and sees only the current phase plus its dependencies. Run once for setup, then switch the phase context before each new OpenSpec change.

Two problems it solves:

1. Lost discipline. Skills are session-scoped; TDD invoked in one session is forgotten in the next. config.yaml is the cross-session memory.
2. Wasted tokens. Loading a full node spec into every session when one phase section plus its consumed contracts (~20 lines) is all that is needed.

When to Use