Switch to directory mount for opencode config, update docs with make

Mount ~/.config/opencode as a directory instead of individual files.
This persists all config changes (opencode.json, oh-my-opencode-slim.json,
skills) across container restarts. Add make to README architecture diagram.

README.md

@@ -110,20 +110,21 @@ docker compose exec -u developer devbox aws --version
 
 ### Custom opencode config
 
-Mount your own `opencode.json` for full control (MCP servers, custom models, etc.):
+For full control over opencode settings (MCP servers, custom models, oh-my-opencode-slim agents, etc.), mount the entire config directory from the host:
 
 ```yaml
 volumes:
-  - ./my-opencode.json:/home/developer/.config/opencode/opencode.json:ro
+  - ~/.config/opencode:/home/developer/.config/opencode
 ```
 
+This persists all configuration changes across container restarts, including `opencode.json`, `oh-my-opencode-slim.json`, and skills. When an existing `opencode.json` is found, the `OPENCODE_PROVIDER` auto-config is skipped.
+
 ### Custom skills
 
-Mount your host's opencode skills into the container:
+Mount agent skills from the host:
 
 ```yaml
 volumes:
-  - ~/.config/opencode/skills:/home/developer/.config/opencode/skills:ro
   - ~/.agents/skills:/home/developer/.agents/skills:ro
 ```
 
@@ -206,14 +207,9 @@ On first start, the entrypoint runs the oh-my-opencode-slim installer in non-int
 
 ### Custom Configuration
 
-You can mount your own oh-my-opencode-slim config instead of using the auto-generated one:
+If you mount the opencode config directory (see Custom opencode config above), the `oh-my-opencode-slim.json` file is included and persists across restarts. Edit it directly to control which models power each agent, fallback chains, council setup, and more.
 
-```yaml
-volumes:
-  - ./oh-my-opencode-slim.json:/home/developer/.config/opencode/oh-my-opencode-slim.json:ro
-```
-
-The config file controls which models power each agent, fallback chains, council setup, and more. See the [oh-my-opencode-slim configuration docs](https://github.com/alvinunreal/oh-my-opencode-slim/blob/master/docs/configuration.md) for the full reference.
+See the [oh-my-opencode-slim configuration docs](https://github.com/alvinunreal/oh-my-opencode-slim/blob/master/docs/configuration.md) for the full reference.
 
 ### Verifying Agents
 
@@ -314,7 +310,7 @@ Container (Debian bookworm)
 ├── opencode binary
 ├── oh-my-opencode-slim (optional — multi-agent orchestration plugin, includes Bun)
 ├── AWS CLI v2 (SSO + Bedrock auth)
-├── neovim 0.12, tmux, htop, bat, eza, zoxide
+├── neovim 0.12, tmux, htop, bat, eza, zoxide, make
 ├── git, ssh, ripgrep, fd, fzf, jq, curl, tree
 ├── Node.js (for MCP servers)
 ├── Bun (optional — included with oh-my-opencode-slim)
@@ -330,10 +326,9 @@ Container (Debian bookworm)
 | `/home/developer/.ssh` | Host bind mount (ro) | ✅ Yes | SSH keys |
 | `/home/developer/.aws` | Host bind mount (if configured) | ✅ Yes | AWS credentials/SSO cache |
 | `/home/developer/.local/share/opencode` | Named volume `devbox-data` | ✅ Yes | Session history, memory |
-| `/home/developer/.config/opencode/opencode.json` | Generated by entrypoint | ❌ No | Provider/model config |
-| `/home/developer/.config/opencode/oh-my-opencode-slim.json` | Generated by entrypoint (if OMOS enabled) | ❌ No | Agent/model mappings |
+| `/home/developer/.config/opencode` | Host bind mount (if configured) | ✅ Yes | opencode.json, oh-my-opencode-slim.json, skills |
 
-**opencode config** (`opencode.json`) is auto-generated from `OPENCODE_PROVIDER` on each start. It sets provider and model only — no MCP servers. To use MCP servers or custom settings, mount your own config file (see Custom opencode config above).
+**opencode config** (`opencode.json`) is auto-generated from `OPENCODE_PROVIDER` on each start. It sets provider and model only — no MCP servers. To persist config changes and use custom settings, mount the config directory from the host (see Custom opencode config above).
 
 ## License