Godot: finish evidence-backed runtime support beyond partial tier

[islee23520]

Source

• README.md and docs/godot-support.md mark Godot as partial.
• docs/godot-support.md says detection, bridge install, status, and workflow skill projection are supported, while .lux init, build, logs/events, runtime inspection, and capture remain planned or unsupported.

Current state

Godot support is intentionally not Unity parity.

Acceptance criteria

• Godot-specific .lux init is implemented and verified.
• Godot build/run/test support is either verified with GoPeak-backed evidence or remains explicitly unsupported in every projection.
• Logs/events, scene/runtime inspection, and screenshot/capture either produce supported evidence or create explicit blocker reports.
• README, usage docs, CLI/API/MCP output, and workflow skill guidance stay aligned with the actual maturity tier.