refactor: convert extension metadata rule to command

[durandom]

Summary

• Converted extension metadata workflow from a cursor rule to a cursor command
• Moved from .cursor/rules/add_extension_metadata.mdc to .cursor/commands/extension_metadata.md
• Improved documentation structure and interactive capabilities

Changes

• Delete .cursor/rules/add_extension_metadata.mdc
• Add .cursor/commands/extension_metadata.md with enhanced documentation

Benefits

• Commands provide better flexibility than rules for interactive workflows
• Improved organization and discoverability
• Maintains all existing functionality while enabling better user interaction

Test Plan

• Files validate and commit successfully
• Verify command works in Cursor IDE
• Test interactive workflow for adding plugin metadata

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[Copilot]

Pull Request Overview

Refactors the existing Cursor workflow from a rule to a command to make the extension metadata process interactive and more flexible.

• Converts the rule-based workflow (.mdc) into an interactive command (.md)
• Enhances documentation with step-by-step actions, validations, and utility commands

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 5 comments.

File	Description
.cursor/rules/add_extension_metadata.mdc	Removed legacy rule-based workflow documentation.
.cursor/commands/extension_metadata.md	Added interactive command documentation with workflows, validation steps, and helper utilities.

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[github-actions]

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