- the is_running() fast-fail fix (v1.3.91) verified cold backend-http-ready
23.5s -> 3.86s and warm 5.0s -> 3.32s on the signed build, no 9Router regression
- strip the [perf] bg entry logs from mcp/skill/settings/service/9router now that
the stall is diagnosed; keep Apps.py per-lifespan timing but only print a
lifespan over 50ms plus the total (cheap regression tripwire)
- document the root cause + fix + before/after in docs/perf/winv2/README.md