strategy_spec_level_unsupported
What happened
The forge_api of the spec is a level this Forge does not run: one that is retired, or one newer than this version knows. The save is refused with 400.
What to do
Save the spec at a level the message lists.
Example
json
{
"error": "This strategy was saved for FORGE_API 3. This version of Forge runs FORGE_API 1.",
"code": "strategy_spec_level_unsupported",
"path": "forge_api"
}