No Error Suppression

Forbidden constructs

• || true
• 2>/dev/null
• Empty catch {}
• Any other form of silent error swallowing

Required behavior

• If a script step fails, the script MUST exit non-zero
• The failure MUST surface on stderr with enough context to diagnose
• Logs MUST retain the failing command's exit code and its error output

Scope

• Shell scripts in scripts/
• TypeScript and Python utilities the host agent invokes
• IPC handlers and outer-boundary process contracts that fall under coding-policy: error-handling's carve-out still need the literal outer-boundary-process-contract grep token + comment