Add OpenCode to README

[pompydev]

What Changed

Updated README to reflect changes made in #1758

Why

To make it clear to readers of README which providers t3code support and how to use them.

Checklist

• This PR is small and focused
• I explained what changed and why

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Note

Low Risk
Documentation-only update with no runtime or behavioral impact.

Overview
Updates README.md to explicitly list OpenCode as a supported provider alongside Codex and Claude, and adds/refreshes installation + authentication links/commands (including updated Codex and Claude URLs).

^{Reviewed by Cursor Bugbot for commit f628210. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Add OpenCode to README as a supported provider

Updates README.md to document OpenCode alongside Codex and Claude as a supported provider. Adds an OpenCode bullet with a link and the opencode auth login command, updates the Codex CLI link, and hyperlinks Claude Code.

^{Macroscope summarized f628210.}

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[macroscopeapp]

Approvability

Verdict: Approved

Documentation-only change to README.md adding OpenCode to the list of supported coding agents and updating existing URLs. No code or runtime behavior is affected.

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[brrock]

Btw cursor also got added and didn't get added to the readme @pompydev

[pompydev]

Btw cursor also got added and didn't get added to the readme @pompydev

Verified that it was added in #1355 but I don't use cursor myself so I'll leave that task for someone who has set up t3code + cursor.

[brrock]

Ok! Thanks for this pr!