fix(feature-dev): use YAML lists for agent tools

[Rohan5commit]

Summary

• convert the tools frontmatter in the feature-dev agents from a comma-separated string to proper YAML lists

Related issue

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

Guideline alignment

• one focused plugin-frontmatter fix in the feature-dev agent files only
• no unrelated command, README, or workflow changes

Validation

• git diff --check
• local Ruby YAML parse confirming each agent now exposes tools as an array

[Copilot]

Pull request overview

Updates the feature-dev agent YAML frontmatter so tools is represented as a proper YAML list (array), fixing frontmatter parsing/linting issues (part of #40370).

Changes:

• Converted tools from a comma-separated scalar to a YAML block list in feature-dev agent files.
• Ensured each affected agent now exposes tools as an array to YAML parsers/linters.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
plugins/feature-dev/agents/code-reviewer.md	Convert tools frontmatter to YAML list for correct parsing.
plugins/feature-dev/agents/code-explorer.md	Convert tools frontmatter to YAML list for correct parsing.
plugins/feature-dev/agents/code-architect.md	Convert tools frontmatter to YAML list for correct parsing.

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