職場で不可欠な存在になる：90日間マスタリープラン

I want to become irreplaceable at work. Analyze my current role, responsibilities, and team dynamics. Then: - Identify the 3 highest-leverage skills that will make me indispensable in my position - Break down each skill into sub-skills I can build - Create a 90-day mastery plan with weekly milestones and daily actions - Include learning resources, tools, and checkpoints to measure progress Format output into a table with columns for Day, Task, Skill Focus, Time Required, and Outcome