Feature Request: Add command to view all-time cumulative token usage

Feature Request

Summary: Add a command (e.g., /usage or /cost --all) to display cumulative token usage across all Claude Code sessions.

Problem

Currently, the /cost command only shows token usage for the current session. There's no built-in way to view total historical token usage across all sessions without accessing the Claude Console (which requires Admin/Billing permissions) or setting up OpenTelemetry.

Proposed Solution

Add a new command or flag that displays:

• Total tokens used (input/output/cache) across all sessions
• Total cost accumulated over time
• Optionally: usage breakdown by day/week/month

Use Case

Users want to:

• Track their personal usage patterns over time
• Monitor spending without needing Console access
• Have quick visibility into cumulative usage directly from the CLI

Alternatives Considered

• Claude Console (requires specific permissions, context switch)
• OpenTelemetry setup (complex, meant for organizational monitoring)

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