fix(redteam): properties add-value send property_name/property_value

[cdot65]

Summary

• airs redteam properties add-value was sending {name, value} and getting HTTP 422 from upstream
• SDK schema (PropertyValueCreateRequestSchema) expects {property_name, property_value}
• Fix renames the request body fields and drops the as never cast that was masking the type mismatch

Closes #197

Test plan

• Unit test in tests/unit/airs/promptsets.spec.ts asserts request body shape
• pnpm lint && pnpm tsc --noEmit && pnpm test && pnpm docs:check all pass
• Manual: airs redteam properties add-value --name <prop> --value <v> returns 200 against live tenant