Per-endpoint fault hooks (latency/error/partial/quota injection)

[CodeBuildder]

Context

Runtime fault injection API for targeting any simulator endpoint. Parent: #18.

Acceptance Criteria

• POST /faults/{endpoint} accepts: type (latency|error|partial|quota), magnitude, duration_ms
• Latency fault adds configured delay to target endpoint responses
• Error fault returns configurable HTTP error codes
• Fault auto-clears after duration_ms; GET /faults lists active faults

Dependencies

Blocked by: none | Blocks: none

Notes

No model tier.