feat(logging): add console color modes

docs/configuration.md

@@ -49,6 +49,7 @@ If set, CLAWDIS derives defaults (only when you haven’t set them explicitly):
 - Console output can be tuned separately via:
   - `logging.consoleLevel` (defaults to `info`, bumps to `debug` when `--verbose`)
   - `logging.consoleStyle` (`pretty` | `compact` | `json`)
+  - `logging.consoleColor` (`auto` | `always` | `never`)
 
 ```json5
 {
@@ -56,7 +57,8 @@ If set, CLAWDIS derives defaults (only when you haven’t set them explicitly):
     level: "info",
     file: "/tmp/clawdis/clawdis.log",
     consoleLevel: "info",
-    consoleStyle: "pretty"
+    consoleStyle: "pretty",
+    consoleColor: "auto"
   }
 }
 ```

docs/logging.md

@@ -74,7 +74,8 @@ Subsystem loggers are created via `createSubsystemLogger("gateway")`.
 Behavior:
 
 - **Subsystem prefixes** on every line (e.g. `[gateway]`, `[canvas]`, `[tailscale]`)
-- **Color only when TTY** (`process.stdout.isTTY` + `NO_COLOR` respected)
+- **Subsystem colors** (stable per subsystem) plus level coloring
+- **Color modes** (`logging.consoleColor`: `auto`/`always`/`never`; `auto` honors `NO_COLOR` and TTY)
 - **Sub-loggers by subsystem** (auto prefix + structured field `{ subsystem }`)
 - **`logRaw()`** for QR/UX output (no prefix, no formatting)
 - **Console styles** (e.g. `pretty | compact | json`)