Function resolveGenerateAtVersion

resolveGenerateAtVersion(
    flags: GenerateFlags,
    config?: DynamodbPluginConfig,
    ref?: ProcessEnv,
): ResolvedGenerateAtVersion
Resolve CLI flags + plugin config into generate-table-definition inputs.

Expansion policy:
- Config strings are already interpolated by the host (do not re-expand).
- Runtime flags are expanded once using get-dotenv's dotenvExpand / interpolateDeep.
- Expansion reference is { ...process.env, ...ref } (ctx wins).
Parameters
- flags: GenerateFlags
  Parsed CLI flags.
- Optionalconfig: DynamodbPluginConfig
  Plugin config slice (already interpolated by host).
- ref: ProcessEnv = process.env
  Env reference (typically ctx.dotenv).
Returns ResolvedGenerateAtVersion
Resolved version, layout config, and generation options.
- Defined in src/get-dotenv/cli/options/generate.ts:63