fix(plugin-dev): make agent-creator frontmatter valid YAML

[Rohan5commit]

Summary

• rewrite the agent-creator frontmatter description as a YAML block scalar
• preserve the existing trigger examples while making the file parse cleanly

Related Issue

• Part of Official plugins have YAML/XML syntax errors (agnix lint) #40370

Guideline Alignment

• one focused syntax fix in a single maintained plugin file
• no behavioral or unrelated documentation changes

Validation

• ruby -e 'require "yaml"; ...' to confirm the frontmatter parses and keeps the examples
• git diff --check

[Copilot]

Pull request overview

Fixes YAML frontmatter parsing for the agent-creator plugin agent by converting the long inline description: value into a valid YAML block scalar while preserving the existing trigger examples.

Changes:

• Rewrites description: from a single-line scalar to a block scalar (description: |) so the frontmatter parses cleanly as YAML.
• Keeps the existing <example> trigger content intact inside the block scalar.

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