fix: use gh aw compile (not --validate) in step 11a checkpoint

[Copilot]

The checkpoint and "What You'll Have When You're Done" section in workshop/11a-build-daily-status.md both referenced gh aw compile --validate as the default compile command, contradicting the guideline that --validate is reserved for targeted troubleshooting/audits — not routine workflow steps.

Changes

• workshop/11a-build-daily-status.md
  • Replace gh aw compile --validate → gh aw compile in the checkpoint item
  • Replace gh aw compile --validate → gh aw compile in the step outcome description