[FEATURE] Show git status summary at session start (with token cost estimate)

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

When I work with claude, it has to optimize frequently because as i asked claude that git status has lot of lines because .venv was not in .gitignore.

Proposed Solution

When starting a session in a git repository, display:

• Quick summary: # staged files, # unstaged files
• Token cost estimate (~200 tokens, ~5,000 tokens, etc.)
• Warning if status is bloated (suggest cleanup)
• Option to proceed or abort

Alternative Solutions

_No response_

Priority

Medium - Would be very helpful

Feature Category

CLI commands and flags

Use Case Example

_No response_

Additional Context

_No response_