fix: eliminate duplicate lead filter requests (Bug 3)

fix: add API key headers, centralize model ID, harden lead parsing

fix: resolve 9 frontend bugs from QA test report

fix: resolve 24 production bugs across 4 code review scans

fix: add NEW MISSION button to reset after completion or error

fix: make lead/session persistence non-fatal on agent run

fix: resolve 5 frontend bugs from test report

docs: add developer onboarding plan and end-user guide

chore: add deployment config for Vercel + Railway

fix: reconcile database with Supabase schema, fix bugs, rewrite README

feat: initial ProplanOS — Anthropic-native multi-agent orchestrator