Avoid Overkill v0.1.0

Initial marketplace release as a Codex plugin and Claude Code plugin.

• Codex: codex plugin marketplace add 6Kmfi6HP/avoid-overkill then codex plugin add avoid-overkill@avoid-overkill
• Claude Code: /plugin marketplace add 6Kmfi6HP/avoid-overkill then /plugin install avoid-overkill@avoid-overkill