docs(blog): use the subscription you already pay for

[TimeToBuildBob]

Summary

Dogfood of gptme 0.33.0 in a clean container: uv tool install gptme then a first reply via ChatGPT Plus and SuperGrok subscription auth. Both paths returned PONG. The wizard still tells that user to buy an API key.

Source: knowledge/blog/2026-09-09-use-the-subscription-you-already-pay-for.md in ErikBjare/bob.
Probe: findings/2026-09-09-gptme-subscription-auth-e2e.md.
Remaining gptme copy/docs gaps: gptme/gptme#3774.

Test plan

• Frontmatter --validate --strict
• OG image generated
• Scoped Jekyll pre-commit (CSS built in worktree)
• Local AI review 5/5, 0 findings @ 57a28bd

[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.

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