docs(site): fix trigger field names in creating-agents guide

[github-actions]

Summary

• Fixes incorrect trigger key names in the "Add triggers" section of the Creating agent definition files guide.
• The guide was using push: and pull_request: (GitHub Actions syntax) where the correct ado-aw front matter keys are pipeline: and pr:. Any reader who copied these examples verbatim would configure triggers that silently do nothing.

Changes

• site/src/content/docs/guides/creating-agents.mdx:
  • Removed the invalid push: trigger section (no such key exists in ado-aw).
  • Added a pipeline: trigger section (pipeline completion trigger — the ado-aw equivalent).
  • Replaced all pull_request: occurrences with pr:.
  • Updated the combined-trigger example and the full "Put it together" example.
  • Added a short preamble naming all three supported trigger types so users know the full set upfront.

Accuracy checks

• src/compile/types.rs OnConfig struct: fields are schedule, pipeline, pr — no push or pull_request field.
• src/compile/common.rs generate_ci_trigger: CI trigger behavior is driven by presence of pipeline or schedule, never a push key.
• site/src/content/docs/reference/front-matter.mdx canonical examples use on.pr: and on.pipeline: consistently.

Validation

• cd site && npm ci && npm run build — 29 pages built, all internal links valid.

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