The per-tool timing line now shows:
- Tokens delta (tokens added to context by this tool call)
- Context window usage percentage
Example: └─ ⚡️ 1ms 523tk | 49% ctx
Changes:
- Updated UiWriter trait print_tool_timing signature
- Track tokens before/after adding tool messages to calculate delta
- Updated ConsoleUiWriter, MachineUiWriter, PlannerUiWriter, and test mocks