Update opencode config filename

[x-n2o]

Summary

Updated the OpenCode configuration filename reference in the documentation from opencode.json to opencode.jsonc to match support for JSON with comments.

Related issues

Closes #636

Validation

Verified that the documentation file src/content/docs/agents/cli-agents/opencode.mdx correctly reflects the opencode.jsonc filename used by the plugin configuration.

Screenshots

None

Follow-ups

None

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[rachaelrenk]

opencode.json and opencode.jsonc are both valid per OpenCode's own docs, so there's no factual error to fix here. Furthermore, the code sample right below the changed line is plain JSON with no comments ({"plugin": ["@warp-dot-dev/opencode-warp"]}), so .json is actually the more accurate filename to pair with that snippet. Switching to .jsonc without adding a comment to the example is inconsistent. I'd recommend closing unless there's a concrete argument for the change -- @hongyi-chen thoughts from an internal perspective?