[skill-activity] fix: replace ✅ shortcode with Unicode emoji in all workshop checkpoint headings

[github-actions]

What was improved

Replaced the Markdown shortcode :white_check_mark: with the literal ✅ Unicode character (U+2705) in the ## Checkpoint heading of all 84 affected workshop files.

Learner pain point addressed

The curriculum evaluator and other tooling match against the literal ✅ Unicode character. Files using the shortcode were scoring 0.0 on checkpoint_quality even when they had well-formed checklist items — masking real content quality from authors and skewing overall corpus scoring.

Why it helps workshop flow

With correctly detected checkpoint headings, the automated rubric accurately reflects each step's self-testing quality. This also ensures consistent checkpoint rendering across all rendered surfaces (GitHub.com, Codespaces preview, VS Code Markdown preview) since the Unicode emoji renders uniformly regardless of the Markdown processor.

Root issue identified by curriculum evaluator: 04-github-actions-intro.md: checkpoint_quality — emoji mismatch causes checkpoint to score 0.0

Warning

Firewall blocked 1 domain

The following domain was blocked by the firewall during workflow execution:

• awmgmcpg

To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
  allowed:
    - defaults
    - "awmgmcpg"

See Network Configuration for more information.

Generated by 🧩 Workshop Skill Activity Author · 24.4 AIC · ⌖ 7.36 AIC · ⊞ 5.1K · ◷

• expires on Aug 10, 2026, 5:06 AM UTC