Build Terminal-Based and API-Driven AI Coding Agent

[Chintanpatel24]

Extends ArrowCode with a local API exposure server, browser-based OAuth flow with secure AES-256-GCM token storage, non-interactive CLI modes, codebase awareness, web search, atomic writes, and explicit confirmation overlays.

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PR created automatically by Jules for task 4728110979368133108 started by @Chintanpatel24

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