Token usage + cost tracker per universe run

[Dhwanil25]

Overview

Show users exactly how many tokens were used and what each universe run cost — broken down per agent and per provider.

UI mockup

After a run completes, show in the post-analysis panel:

Run cost breakdown
──────────────────────────────────────────
Researcher   claude-sonnet-4-6   1,240 in / 890 out   $0.017
Analyst      gemini-2.5-flash      980 in / 650 out   $0.001
Coder        gpt-4.1-mini          870 in / 720 out   $0.002
Reviewer     llama-3.3-70b (Groq)  760 in / 540 out   $0.001
Synthesis    claude-sonnet-4-6   3,200 in / 980 out   $0.024
──────────────────────────────────────────
Total                                                  $0.045

Implementation

• Parse usage field from each provider's streaming response (all major providers return this)
• Store { inputTokens, outputTokens } per agent in MAAgent
• Look up price per token from the ALL_MODELS table already in SettingsPage.tsx
• Display in post-analysis panel and the Analytics page

Relevant files

• src/lib/multiAgentEngine.ts — capture usage from SSE responses
• src/components/pages/UniversePage.tsx — display in post-analysis panel
• src/components/pages/AnalyticsPage.tsx — aggregate cost over time