README: Add OpenCode to first mention of supported agents

[notrudyyy]

What Changed

Added OpenCode to the list of supported agents in the first paragraph.

Why

First paragraph mentions Claude and Codex as supported. Right below it Claude, Codex, and OpenCode are mentioned as supported.

UI Changes

NA

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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Note

Low Risk
Low risk documentation-only change that just updates the supported agents list with no runtime or behavioral impact.

Overview
Updates README.md to include OpenCode in the first mention of supported coding agents, aligning the intro text with the supported providers listed below.

^{Reviewed by Cursor Bugbot for commit 58dab13. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add OpenCode to the list of supported agents in README

Updates README.md to include OpenCode alongside Codex and Claude in the introductory description and the WARNING support line.

^{Macroscope summarized 58dab13.}

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[macroscopeapp]

Approvability

Verdict: Approved

Documentation-only change adding OpenCode to the list of supported agents in the README. No runtime impact.

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[gameroman]

Also related to #2154