feat: add human approval step for appeal letter generation and update synthetic docs gen

Update SOP guidelines to explicitly require formal appeal letters

Draft appeal letter using claim backend data

Update simulated claim database with extended metadata

Reset simulated databases for clean demo run

Add session metrics tracking for execution time, tokens, and cost

Remove Arize AI Phoenix integration

Instrument application with Arize Phoenix OpenTelemetry observability

Update intro screen copy

Add intro screen overlay to webapp

Update Hugging Face space title for link preview

Fix Hugging Face user permissions for SQLite writing

Trigger Hugging Face Rebuild

Hide Finalization Agent and consolidate into Execution Agent

Add Hugging Face configuration README

Deploy Claim Resolution Expert to Hugging Face