feat: Superpowers guidance only with evidence of use #353

Why

Superpowers guidance goes only into projects with prior use (design Decision 5).

In scope

Detect prior Superpowers use per project; add guidance only there.

Out of scope

Installing Superpowers.

Acceptance criteria

• A project with no prior use gets no Superpowers guidance

Dependencies

Blocked by: #332

Blocks: #386

Plan

• Release: 4.0.0-beta.2
• Size: size:S · Workstream: ws:project-scope
• Epic: feat: project-scope P4, Brain, agent-browser, embeddings and Superpowers (epic) #299
• Card: P4-04 in the card inventory
• Sources: Design (docs(plans): project-scoped management design and its prerequisites #289) Superpowers

Verification

• node scripts/run-tests.mjs focus (new superpowers tests)