docs: add opencode-claude-memory to ecosystem

[kuitos]

Issue for this PR

N/A - documentation-only ecosystem listing.

Type of change

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

What does this PR do?

Adds opencode-claude-memory to the community plugins section of the ecosystem page.

The plugin shares Claude Code-compatible persistent Markdown memory between OpenCode and Claude Code.

How did you verify your code works?

Ran git diff --check locally.

Screenshots / recordings

N/A - documentation table entry only.

Checklist

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

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[github-actions]

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