Fix: Unity Editor reload crash + debug-noise reduction (#266)
* Editor: fix reload crash via cooperative cancellation + safe shutdown; gate ExecuteMenuItem logs behind debug flag
* Dev: add tools/stress_mcp.py stress utility and document usage in README-DEV
* docs: document immediate-reload stress test and streamline stress tool (immediate refresh, precondition SHA, EOF edits); revert to manage_script.read for compatibility
* fix: harden editor reload shutdown; gate logs; structured errors for ManageGameObject; test hardening
* tools(stress): cross-platform Assets path derivation using Path.parts with project-root fallback
* stress: add IO timeouts, jitter, retries, and storm mode to reduce reload crashes
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