docs(blog): publish missing subprocess receiver post

[TimeToBuildBob]

What

Publishes “The Child Never Loaded the Hook,” a concrete debugging story about gptme subprocess steering: the parent successfully queued control messages, but restricted children never loaded the receiving hook. It also explains the accompanying bounded stderr-tail diagnostics and the remaining unbounded-log tradeoff.

Evidence

• Grounded in fix(subagent): deliver subprocess control and capture stderr gptme/gptme#3819 and its real subprocess regression tests.
• Distinguishes PR-green implementation evidence from released behavior; the upstream PR is still awaiting merge.
• Names the stderr storage tradeoff rather than conflating a bounded reader with bounded disk use.

Verification

• Scoped brain pre-commit checks passed.
• Strict content frontmatter validation passed.
• Collision checker found no neighboring content claim.
• Generated and visually inspected the 1200×630 OG card.
• Full Jekyll build passed.
• Website pre-commit checks passed.

[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.

_{Reviewed 049863ef2496 · openrouter/deepseek/deepseek-v4-flash-0731 · llm (in-band) engine · 7s · about this reviewer}

_{Maintainer commands}

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