feat(plugin): real-time session statistics (cost, tokens, cache, context usage) #825
Description
Purpose
Display exact real-time session statistics in Claude Code status bar — cost, tokens, cache hit rate, context window usage. Plugin can access API response metadata that MCP cannot.
Changes
packages/codingbuddy-plugin/— Session tracker module- Status bar rendering:
[CB] | session:Xm | ~$X.XX | Xk tokens | Cache: X% | ctx:X%
Supersedes
- feat(tui): add session statistics display (cost, tokens, cache rate, context usage) #805 (TUI session stats) — Plugin approach is more accurate than MCP estimation
Acceptance Criteria
- Track cumulative tokens from API usage field
- Calculate cost based on model pricing
- Calculate cache hit rate (cache_read vs cache_creation)
- Calculate context window usage percentage
- Display in Claude Code status line
- Update after each API call