[docs-linker] workshop docs: add gh-aw doc links

This PR adds inline doc links to 7 workshop side-quest files, connecting bare concept terms to their official gh-aw documentation pages.

Changes by file

workshop/side-quest-11-07-openai-key.md

• frontmatter → Frontmatter reference

workshop/side-quest-11-08-frontmatter-tools-outputs.md

• task brief → Markdown — Writing Effective Instructions

workshop/side-quest-11-09-agent-session-phases.md

• frontmatter → Frontmatter reference
• permissions → GitHub Tools Read Permissions
• task brief → Markdown reference

workshop/side-quest-12-01-iterate-agent-output.md

• triggers → Triggers reference

workshop/side-quest-13-01-schedule-expressions.md

• lock file → Workflow Structure — Lock File Header

workshop/side-quest-13-03-pr-checklist-pattern.md

• workflow brief → Markdown reference

workshop/side-quest-13-04-token-optimization.md

• MCP → MCP Gateway reference
• schedule → Triggers — Scheduled Triggers

network:
  allowed:
    - defaults
    - "awmgmcpg"

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• expires on Aug 21, 2026, 6:33 AM UTC