* fix(prometheus): enforce path constraints and atomic write protocol
- Add FORBIDDEN PATHS section blocking docs/, plan/, plans/ directories
- Add SINGLE ATOMIC WRITE protocol to prevent content loss from multiple writes
- Simplify PROMETHEUS_AGENTS array to single PROMETHEUS_AGENT string
* fix: reconcile Edit tool signature in interview-mode.ts with identity-constraints.ts
Identified by cubic: Edit tool usage was inconsistent between files.
- interview-mode.ts showed: Edit(path, content)
- identity-constraints.ts showed: Edit(path, oldString="...", newString="...")
Updated interview-mode.ts to use the correct Edit signature with oldString and newString parameters to match the actual tool API and prevent agent hallucination.
ec1cb5db05