docs: update documentation to OKF v0.1 format

docs/index.md

@@ -0,0 +1,16 @@
+---
+okf_version: "0.1"
+---
+
+# Architecture
+* [System Architecture](/architecture/system-overview.md) — Component map of 10Backward: entrypoint, config, logging, runner, state, and cron wiring.
+* [Config Schema](/architecture/config-schema.md) — Required/optional env vars, validation rules, and the typed Config dataclass.
+* [Logging & Run Summary](/architecture/logging.md) — JSON formatter, secret redaction, and structured event helpers.
+* [Pipeline Runner](/architecture/pipeline-runner.md) — How a cron tick becomes startup + retry-wrapped pass + run_complete.
+
+# Operations
+* [Environment Variable Setup](/operations/environment-setup.md) — Required env vars, renamed keys, and how to populate `.env`.
+* [Cron Lifecycle](/operations/cron-lifecycle.md) — How `entrypoint.sh` renders `/etc/cron.d/tenbackward` and hands off to `cron -f`.
+
+# User Guides
+* [Daily Run Guide](/guides/daily-run.md) — Tester/operator walkthrough of a manual daily cron tick and expected log/output behaviour.