[skill-activity] Make Anthropic key side quest command-driven

[github-actions]

What: Reworked workshop/side-quest-11-06-anthropic-key.md (lowest-scoring flagged file in the curriculum-eval issues, 5.37).

• Replaced UI click-path for the secret with gh secret set ANTHROPIC_API_KEY / gh secret list, with expected output (browser path kept as a short tip).
• Added expected compile output and a grep check that the lock file references the secret.
• Checkpoint items are now verifiable by command.
• Trimmed duplicate explanations in the mistakes list.

Pain point: Cognitive load and low activity density in a procedural setup page; learners couldn't tell whether the secret or compile worked.

Flow: Matches the Codespaces-first terminal route; gh is already installed by this point. Markdownlint couldn't run in the sandbox (npm blocked), so please rely on CI.

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Generated by 🧩 Workshop Skill Activity Author · copilot · auto · 19.4 AIC · ⌖ 0.793 AIC · ⊞ 8.4K · ◷

• expires on Oct 20, 2026, 2:44 AM UTC