Document the planned CRM domain

[ReidSurmeier]

Summary

• record the repository as a planned scaffold without overstating implementation or deployment
• define Party roles as relationships and separate Works from physical Inventory Objects
• establish Inventory Intake as the first implementation tracer bullet
• add four test-first repository contracts and validation-only GitHub CI

Verification

• npm ci
• npm test (4 passed)
• npm audit (0 vulnerabilities)
• git diff --check

No application code, real gallery data, Pages site, or deployment was added.