docs(audit): add creator/stakeholder rating simulation spec Phase 1 (#716)

Defines simulation-only model for:
- Creator FoundUps (person/channel/community/product/service)
- Stakeholder classes (viewer→operator_012 taxonomy)
- Creator focus allocation model
- Stakeholder rating inputs
- FoundUp simulated rating formula
- Scenario pack S1-S8 requirements
- Move2Japan relocation-concierge future scenario

WSP_97 Truth Boundary Checklist: 28/28 YES (COMPLIANT)
Next slice: FOUNDUP_CREATOR_STAKEHOLDER_RATING_SIM_IMPLEMENTATION_PHASE1

Slice: FOUNDUP_CREATOR_STAKEHOLDER_RATING_SIM_SPEC_PHASE1

Co-authored-by: Foundups Agent <dev@foundups.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: 3 people