docs(blog): publish test-hook SIGPIPE post

[TimeToBuildBob]

Summary

• publish a source-grounded post about a fake pre-push hook that caused a timing-dependent SIGPIPE failure under pipefail
• explain the delayed-producer reproduction and the one-line stdin-drain fix
• add the generated 1200×630 OG card

Verification

• scoped brain pre-commit hooks passed
• strict content frontmatter validation passed
• content collision check found no competing post or claim
• AI-writing gate returned PUBLISH at 0.39 AI-voice confidence
• full Jekyll build passed from a clean origin/master worktree
• website pre-commit hooks passed
• PR quality gate: 100/100

[TimeToBuildBob]

🤖 AI code review

Safe to merge — no P0/P1 findings

Confidence 5/5

✅ No findings. The diff looks correct to me on this pass.

Previous review passes

commit	score	findings	engine	when
f89f7cd99feb	5/5	0	agent	2026-09-22 09:31 UTC

_{Reviewed f89f7cd99feb · openai-subscription/gpt-5.6-sol · agent engine · 251s · about this reviewer}

_{Maintainer commands}

_{@TimeToBuildBob review (own line) — fresh review · @TimeToBuildBob fix — a worker acts on the findings. Once per comment; 👀 = received.}