Local failure model
Local calls use three channels:Remote hierarchy
REMOTE ERROR TREE ยท PREVIEW
Catch from specific to general:
Diagnostics belong to the owning layer
- Language findings link to the error register.
- Engine exits keep the machine surface contract.
- Remote API errors carry status, response body and optional request id.
- Product errors should wrap these facts, not replace them.
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Type index
Scan every exported result and error type.
Security boundary
Refuse before execution where possible.