feat: integrate unity-mcp (CoplayDev) into OCGS framework

[striderZA]

Summary

Adds the CoplayDev unity-mcp server as a third MCP integration in OCGS, alongside the existing aseprite and godot MCPs. Mirrors the established patterns throughout.

• MCP config: New mcp.unity block in opencode.json (HTTP, localhost:8080, disabled by default) — same opt-in shape as mcp.godot
• Skill docs: New §7.4 in setup-engine/SKILL.md (root + core module copies, byte-identical) covering prerequisites, install, Editor-running constraint, manual config fallback, and troubleshooting
• Agent references: All 5 unity specialists (unity-specialist + 4 sub-specialists) gain a ## MCP Integration section with domain-specific tool hints
• Module version: engine-unity bumped 0.6.0 → 0.7.0
• Changelog: New v0.4.0 — Unity MCP Integration section in UPGRADING.md

Transport choice

HTTP (http://localhost:8080/mcp), the upstream default. Unity MCP runs as a package inside Unity Editor, not as a standalone CLI, so it differs from the godot/aseprite command: [...] shape — this is a deliberate, documented divergence.

Test Plan

• node tests/agents/validate.mjs → 182/182 PASS (51 agents, 77 skills, 53 commands, 1 cross-reference)
• node .opencode/plugins/tests/test-*.mjs → 11/11 files, 129/129 scenarios PASS
• opencode.json valid JSON
• §7.4 unity-mcp content byte-identical between .opencode/skills/setup-engine/SKILL.md and .opencode/modules/core/skills/setup-engine/SKILL.md (modular framework invariant preserved)
• All 5 unity specialists have ## MCP Integration section with identical closing clause
• Pre-existing §7.4 (Build & Run Setup for SFML3/Raylib) renumbered to §7.5 in root monolith; no renumbering needed in core copy (SFML3/Raylib are optional modules absent from core)

Non-blocking follow-ups

Two spec-inherited tool-name nits surfaced during final review — fixable in a follow-up spec amendment, do not block merge:

• manage_package (singular) → manage_packages (plural) in unity-addressables-specialist.md and setup-engine/SKILL.md §7.4 references
• list_scenes in §7.4 "Verify" example isn't a documented tool; closest is manage_scene(action="get_active")

Notes

• Spec and plan files in framework/docs/superpowers/ were created locally and intentionally NOT committed to this branch (treated as local-only working artifacts)
• Per the implementation plan, an automated smoke-test skill for Unity is out of scope (Unity in batchmode is finicky); integration is interactive-dev only

[github-actions]

PR Review: feat/unity-mcp-integration

Overall: Clean, well-structured PR. Follows established patterns consistently. The two tool-name nits are already acknowledged.

Issues

1. opencode.json — type: "local" with url may not work (opencode.json:29-33)

"unity": {
  "type": "local",
  "url": "http://localhost:8080/mcp",
  "enabled": false
}

The existing MCPs (aseprite, godot) both use command: [...] (stdio protocol). This config uses url (HTTP) under type: "local". If OpenCode requires command for type: "local", this block will be silently ignored or error out. It may need "type": "remote" or separate handling.

The PR description calls this a "deliberate, documented divergence" but does not document where in OpenCode's schema type: "local" + url is valid. Could you confirm this works at runtime? If it does, consider adding a comment noting OpenCode supports HTTP MCP under type: "local" (future readers won't know).

2. manage_package should be manage_packages (acknowledged in PR)

.opencode/modules/engine-unity/agents/unity-addressables-specialist.md:169:

manage_package for Addressables package management

Upstream unity-mcp uses plural manage_packages. Same mismatch in setup-engine/SKILL.md §7.4 references.

3. list_scenes — not a documented unity-mcp tool (acknowledged in PR)

setup-engine/SKILL.md:731 (and core copy) uses list_scenes as the verify example. Closest documented tool is manage_scene(action="get_active").

Suggestions

4. pip install uv could be ambiguous — setup-engine/SKILL.md:692

install `uv` via `pip install uv` (or `winget install astral-sh.uv` on Windows)

pip install uv installs uv into the Python environment (e.g., .local/bin/), which may or may not be on PATH. The official install recommends:

curl -LsSf https://astral.sh/uv/install.sh | sh

Consider adding this as the primary option and pip install uv as the fallback.

5. Version in modulefile is semantic — no issues detected ✅

0.6.0 → 0.7.0 is a correct minor bump for adding MCP integration documentation.

Verdict

Merge with minor follow-ups — no blockers. Fix the two tool-name nits (manage_package → manage_packages, list_scenes → manage_scene) and verify whether type: "local" + url works against your OpenCode version before closing.

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