docs(ecosystem): add community plugin and agents listings for loop engineering feature

[toshilam]

Issue for this PR

N/A - docs-only ecosystem listings.

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Adds both community plugins and agent to the ecosystem plugins table

• forloop-agents
• forLoop-planner-plugin

How did you verify your code works?

• both unit tested locally
• Github action verified
• E2E tested manually to make sure from installing all way to development work as expected

Screenshots / recordings

If this is a UI change, please include a screenshot or recording.

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

If you do not follow this template your PR will be automatically rejected.

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

The search results show several ecosystem documentation PRs for adding plugins, but none of them appear to be duplicates of PR #31370. The other PRs (like #29006, #26605, and #27266) are for adding different specific plugins to the ecosystem documentation, which is a different scope than the current PR that adds the forloop-agents and forLoop-planner-plugin listings.

No duplicate PRs found

[github-actions]

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