Hook-based model routing state + prompt-size switching

[aayushostwal]

Summary

• persist plugin runtime model state to .nexus/model-router-runtime.json on hook execution (no Nexus CLI required)
• route Claude model on user-prompt-submit using prompt-size thresholds, with terminal logs on switch/restore/keep
• keep Codex in observe-only mode while still recording current runtime model state
• add hook-level tests for session-start state creation, Claude switch/restore flow, and Codex runtime state capture
• document runtime state file path and threshold env vars in README

Validation

• node --test

[vercel]

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Project	Deployment	Actions	Updated (UTC)
nexus	Ready	Preview, Comment	May 13, 2026 2:22pm