Fix the hotbar client test transport body construction so the suite parses and runs again, and normalize AAA marker ordering in the flagged C# tests to restore readability consistency with the test template.
Audit all test files and bring them in line with formatting/style expectations by adding explicit AAA markers across server test methods and fixing GDScript test lint/format issues.
Add server/client tests for duplicate-slot, schema, missing-player, normalization, and busy/error handling paths, and include Bruno requests for the new hotbar routes with happy and representative failure checks.
Ship a server-owned hotbar loadout API with Postgres-or-memory persistence so slot bindings survive reconnects in configured environments. Wire client boot hydration and add tests/docs/manual QA to keep the prototype contract and policy explicit.