docs: rewrite README and runbook for current platform state
README: updated architecture diagram, three signal layers, tracked
universe, autonomous trading engine, global news interpolation,
competitive intelligence, paper trading, notification service,
updated services table, project structure, deployment, endpoints.
Runbook: updated service overview, deployment via runmefirst.sh,
secrets management (keys in kube dir not repo), backup/restore
scripts, trading engine operations, signal layer toggles, database
nuke & rebuild, monitoring, CI/CD, removed hardcoded secrets.
Celes Renata
9aae57f3e1