feat: executable plugin protocol for process-isolated providers

[frostebite]

Summary

• Adds CliProtocolProvider — a ProviderPlugin implementation that spawns an external binary and communicates via JSON-over-stdin/stdout protocol, enabling process-isolated provider plugins
• Extends PluginLoader with executable: prefix to load standalone binaries as plugins
• Adds engine smoke test CI workflow for Godot and (manual) Unreal Engine testing
• Full test coverage for the protocol provider and plugin loader

How it works

// Load an executable as a plugin
await PluginLoader.load('executable:/path/to/game-ci-orchestrator');

// Or via yargs options
game-ci remote build --providerStrategy cli-protocol --provider-executable ./game-ci-orchestrator

The CliProtocolProvider spawns the executable with serve args, writes JSON to stdin, reads JSON from stdout. Supports streaming output for long-running commands (run-task, watch-workflow).

Dependencies

• Based on feat/bun-migration-plugin-system
• Companion PR in orchestrator repo: feat: JSON protocol server mode + engine smoke tests orchestrator#6 (feat/cli-protocol-server)

Test plan

• CliProtocolProvider unit tests — construction, method presence, error handling
• PluginLoader tests — executable: prefix routing, error cases
• CI: engine-smoke-test.yml validates protocol integration with real binaries
• CI: Godot container smoke test

🤖 Generated with Claude Code

[coderabbitai]

Important

Review skipped

Auto reviews are disabled on base/target branches other than the default branch.

Please check the settings in the CodeRabbit UI or the .coderabbit.yaml file in this repository. To trigger a single review, invoke the @coderabbitai review command.

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 83c272e9-8b5b-477d-886e-c40ea09e97f3

You can disable this status message by setting the reviews.review_status to false in the CodeRabbit configuration file.

Use the checkbox below for a quick retry:

• 🔍 Trigger review

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/executable-plugin-protocol

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}