docs(09): capture phase context

.planning/phases/09-tooling-portable-setup/09-DISCUSSION-LOG.md

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+# Phase 9: Tooling & Portable Setup - Discussion Log
+
+> **Audit trail only.**
+
+**Date:** 2026-06-14
+**Phase:** 9-Tooling & Portable Setup
+**Areas discussed:** Custom Docker image, Setup script approach
+
+---
+
+## Custom Docker Image
+
+| Option | Description | Selected |
+|--------|-------------|----------|
+| In this repo | Dockerfile in ngn-agent repo, pin tool versions | ✓ |
+| Dedicated repo | Separate repo for image build | |
+
+**User's choice:** In this repo, pin tool versions
+**Notes:** Dockerfile at `ngn-agent/docker/Dockerfile`, build script at `ngn-agent/docker/build.sh`.
+
+---
+
+## Setup Script Approach
+
+| Option | Description | Selected |
+|--------|-------------|----------|
+| Full setup + config | All config, secrets prompted, directory creation, volume mounts, skills, cron | ✓ |
+| Config only | Just copy config files | |
+
+**User's choice:** Full setup. Secrets specified during setup with interactive prompts.
+**Notes:** Script creates everything. Assumes Hermes installed. Interactive prompts for secrets.
+
+---
+
+## the agent's Discretion
+
+- Dockerfile tool version selection
+- Setup script interactive flow design
+- Config file template generation
+
+## Deferred Ideas
+
+- Multi-architecture builds
+- Cloud-native deployment
+- CI/CD for images