docs(blog): publish idle subagent delivery post

[TimeToBuildBob]

Summary

• explain why subagent completion callbacks did not reach idle server conversations
• extract the four delivery contracts: ownership, persistence, atomic wake reservation, and client rendering
• distinguish the open implementation in feat(subagent): deliver completions to idle server sessions gptme/gptme#3897 from a shipped release
• include and verify the generated OG image

Verification

• scoped brain pre-commit hooks passed
• strict frontmatter validation passed
• content collision check passed
• full Jekyll build passed
• website pre-commit hooks passed
• OG image inspected at 1200×630

[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
0ed7fbfec856	5/5	0	agent	2026-09-21 01:49 UTC
0ed7fbfec856	5/5	0	agent	2026-09-21 05:59 UTC

_{Reviewed 0ed7fbfec856 · openai-subscription/gpt-5.6-sol · agent engine · 137s · about this reviewer}

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