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Under a loaded parent, the FIRST piped Bun.spawn in a process intermittently yields an empty stderr even though the child wrote it and exited 0 — measured identically with readers-attached-before-exit and with a manual getReader() drain, so it's loss inside the async pipe plumbing, not read ordering. It flaked `$B skill test` (bun test writes its banner to stdout and the pass/fail summary to stderr, so a dropped stderr silently degraded the result to just the banner) and would blank a skill's JSON result on `$B skill run` while still reporting success. New runToFiles() points the child's stdout/stderr at temp files via Bun.file() (never raw fds — closing self-opened fds around a spawn tripped Bun's fd bookkeeping into a stray epoll_ctl EBADF), awaits exit, then reads the files: the kernel has flushed everything by child exit, so the post-exit read is complete, and chatty children can't stall on a full pipe buffer. Both handleTest and spawnSkill route through it (timeout + capped read preserved via timeoutMs/maxStdoutBytes). Bun.spawnSync would also capture reliably but would deadlock: a spawned skill calls back into this same daemon on GSTACK_PORT. The `tests passed for "<name>"` fallback is gone — a passing bun test always prints a summary, so exit 0 with no output means the run was NOT captured, and handleTest now throws instead of fabricating success. The E2E assertion checks both stream halves (banner + summary + "Ran N tests") instead of the loose alternation whose `tests passed` branch matched the synthetic fallback vacuously. A static tripwire pins the structure: runToFiles owns the module's ONLY Bun.spawn, and no site reads child output via stdout:'pipe' / new Response(proc.stdout) / getReader(). Scope: the PR's repo-wide test-file sweep is deliberately not absorbed — this is the core only, per the wave plan. Tests: browser-skill-commands + browser-skills-e2e + browser-skill-write 74 pass, 0 fail. Re-derived from PR #2559 by @frederik-kaster-noygear. Co-authored-by: Frederik Kaster <frederik.kaster@noygear.ai> Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>