chore: initialize monorepo with project scaffolding, configs, and CI setup

docs/miner.md

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+# Miner (Host Ops) – Task Breakdown
+
+## Status (2025-09-27)
+
+- **Stage 1**: Infrastructure scripts pending. Runtime behavior validated through `apps/miner-node/` control loop; host installer/systemd automation still to be implemented.
+
+## Stage 1 (MVP)
+
+- **Installer & Scripts**
+  - Finalize `/root/scripts/aitbc-miner/install_miner.sh` to install dependencies, create venv, deploy systemd unit.
+  - Implement `/root/scripts/aitbc-miner/miner.sh` main loop (poll, run job, submit proof) as per bootstrap spec.
+  - Ensure scripts detect GPU availability and switch between CUDA/CPU modes.
+
+- **Configuration**
+  - Define `/etc/aitbc/miner.conf` with environment-style keys (COORD_URL, WALLET_ADDR, API_KEY, MINER_ID, WORK_DIR, intervals).
+  - Document configuration editing steps and permission requirements.
+
+- **Systemd & Logging**
+  - Install `aitbc-miner.service` unit with restart policy, log path, and hardening flags.
+  - Provide optional logrotate config under `configs/systemd/` or `configs/security/`.
+
+- **Mock Coordinator Integration**
+  - Supply FastAPI mock coordinator (`mock_coordinator.py`) for local smoke testing.
+  - Document curl or httpie commands to validate miner registration and proof submission.
+
+- **Documentation**
+  - Update `apps/miner-node/README.md` (ops section) and create runbooks under `docs/runbooks/` once available.
+  - Add troubleshooting steps (GPU check, heartbeat failures, log locations).
+
+## Stage 2+
+
+- Harden systemd service with `ProtectSystem`, `ProtectHome`, `NoNewPrivileges` and consider non-root user.
+- Add metrics integration (Prometheus exporters, GPU telemetry).
+- Automate zero-downtime updates with rolling restart instructions.