Take home challenge ayush

[ghosh-ayush]

• Refactored Gemini and ChatGPT agent logic to ensure run_id is always set before capturing and sending user memory.
• Implemented robust SPA navigation detection using MutationObserver and pendingMemoryCapture flags.
• Updated memory capture flow to use a callback, guaranteeing run_id is up-to-date before POSTing to the Mem0 API.
• Unified logic across agents for reliable run_id extraction and memory association.

[CLAassistant]

All committers have signed the CLA.