[guidelines] fix obvious guideline violations in 9 file(s)

Summary

This PR fixes the GitHub emoji shortcode guideline violation in 9 side-quest workshop files.

The guideline states:

Write checkpoint headings as ## :white_check_mark: Checkpoint so they use the same browser-independent rendering as other icons.

All 9 files used the raw Unicode ✅ character instead of the :white_check_mark: shortcode.

File	Fix applied
`workshop/side-quest-13-03-pr-checklist-pattern.md`	`## ✅ Checkpoint` → `## :white_check_mark: Checkpoint`
`workshop/side-quest-13-04-token-optimization.md`	`## ✅ Checkpoint` → `## :white_check_mark: Checkpoint`
`workshop/side-quest-15-01-expressions-and-contexts.md`	`## ✅ Checkpoint` → `## :white_check_mark: Checkpoint`
`workshop/side-quest-15-02-chaining-conditions.md`	`## ✅ Checkpoint` → `## :white_check_mark: Checkpoint`
`workshop/side-quest-16-01-github-output.md`	`## ✅ Checkpoint` → `## :white_check_mark: Checkpoint`
`workshop/side-quest-16-02-secrets-and-permissions.md`	`## ✅ Checkpoint` → `## :white_check_mark: Checkpoint`
`workshop/side-quest-16-03-token-exfiltration.md`	`## ✅ Checkpoint` → `## :white_check_mark: Checkpoint`
`workshop/side-quest-16-04-deterministic-vs-agentic-data-ops.md`	`## ✅ Checkpoint` → `## :white_check_mark: Checkpoint`
`workshop/side-quest-16-05-long-lived-credentials.md`	`## ✅ Checkpoint` → `## :white_check_mark: Checkpoint`

Warning

Firewall blocked 1 domain

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

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.

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expires on Aug 28, 2026, 4:11 AM UTC