feat: add OpenCode integration (plugin + setup)

[ComputelessComputer]

Summary

Add support for OpenCode alongside the existing Claude Code integration. RTK's rewrite engine (rtk rewrite) is already agent-agnostic — this PR wires it into OpenCode's plugin system.

What's included

File	Purpose
opencode/plugins/rtk-rewrite.ts	tool.execute.before hook that calls rtk rewrite to transparently rewrite bash commands
opencode/rtk-awareness.md	Slim RTK instructions for AGENTS.md (meta commands, verification)
opencode/setup.sh	One-command installer — copies plugin + patches AGENTS.md (global or per-project)
opencode/README.md	Setup guide, command table, comparison with Claude Code flow

How it works

OpenCode plugins hook into tool.execute.before. When the tool is bash, the plugin:

1. Extracts the command string from output.args.command
2. Calls rtk rewrite <cmd> (same Rust binary / registry used by the Claude Code hook)
3. If a rewrite is returned, replaces the command — otherwise passes through unchanged

Commands already prefixed with rtk and heredocs are skipped. The plugin gracefully disables itself if rtk is missing or < 0.23.0.

Setup

# Global (all OpenCode projects):
./opencode/setup.sh

# Per-project:
./opencode/setup.sh --local

Or manually copy opencode/plugins/rtk-rewrite.ts to ~/.config/opencode/plugins/.

Co-Authored-By: Oz oz-agent@warp.dev

[pszymkowiak]

Thanks for the contribution! OpenCode support has been merged into develop via #300 (plugin + init lifecycle). It will be available in the next release once develop is merged to master. This PR is now superseded — if you'd like to contribute further, check the open issues!

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

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[pszymkowiak]

Hi! Two things needed before we can review:

1. Retarget to develop — this PR targets master, but all PRs should target develop. You can change the base branch in the PR settings (right sidebar).
2. Sign the CLA — if not already done, please sign at https://cla-assistant.io/rtk-ai/rtk

Thanks!

[aeppling]

Hey

We are cleaning up the codebase and improving the project structure for better onboarding. As part of this effort, PR #826 reorganizes src/ from a flat layout into subfolders.

No logic changes — only file moves and import path updates.

What you need to do

Rebase your branch on develop when receiving this comment:

git fetch origin && git rebase origin/develop

Git detects renames automatically. If you get import conflicts, update the paths:

use crate::git;        // now: use crate::cmds::git::git;
use crate::tracking;   // now: use crate::core::tracking;
use crate::config;     // now: use crate::core::config;
use crate::init;       // now: use crate::hooks::init;
use crate::gain;       // now: use crate::analytics::gain;

Need help rebasing? Tag @aeppling