[FEATURE] progress bar for context window used/remaining

Since context management is such an important part of getting good performance out of claude code. I would love to see a visual indicator of how much context is used and remaining in the console.

Something like a progress bar

[=============== (100/200k context used ) ]

when full, we are out of context and compaction will run

This would help me optimize things such as,

• what really needs to be in the CLAUDE.md
• how much information should I read in at the start of a new session?
• when should I start summarizing and writing documentation before compaction
• how much effort I should put into creating agents to reduce context burn rate?
• would now be a good time to call the compaction?
• how should I order the execution of items in a long plan?

and probably a lot of other uses as well