## ADDED Requirements

### Requirement: Platform startup loads local environment files
The platform SHALL load local `.env` configuration before constructing runtime configuration for storage initialization.

#### Scenario: Platform env file selects MySQL storage
- **WHEN** `platform/.env` contains `PLATFORM_STORAGE_BACKEND=mysql` and `PLATFORM_MYSQL_DSN`
- **THEN** platform configuration MUST use the MySQL storage backend and DSN from the env file

#### Scenario: Process environment overrides env file
- **WHEN** a process environment variable and a local `.env` file both define the same platform setting
- **THEN** platform configuration MUST use the process environment value

### Requirement: Metadata backend selection remains database-backed
The platform SHALL initialize the configured metadata repository through the existing store boundary rather than falling back to hardcoded local sample data.

#### Scenario: MySQL storage is configured
- **WHEN** `PLATFORM_STORAGE_BACKEND=mysql` and a non-empty `PLATFORM_MYSQL_DSN` are loaded
- **THEN** platform startup MUST initialize the MySQL metadata store

#### Scenario: MySQL storage is missing DSN
- **WHEN** `PLATFORM_STORAGE_BACKEND=mysql` is loaded without `PLATFORM_MYSQL_DSN`
- **THEN** platform startup MUST fail with a direct configuration error instead of silently using file or memory storage