Add waiting arcade MVP

docs/config.md

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+# Config
+
+Logicsrc stores user config at:
+
+```text
+$HOME/.logicsrc/config.json
+```
+
+Read and write values with dot paths:
+
+```bash
+logicsrc config get waiting.arcade.enabled
+logicsrc config set waiting.arcade.enabled true
+logicsrc config set waiting.arcade.defaultGame hangman
+logicsrc config set waiting.arcade.autoStartAfterSeconds 15
+```
+
+Default Waiting Arcade config:
+
+```json
+{
+  "waiting": {
+    "arcade": {
+      "enabled": true,
+      "defaultGame": "hangman",
+      "random": false,
+      "autoStartAfterSeconds": 0,
+      "interruptOnApproval": true,
+      "interruptOnDone": true,
+      "interruptOnError": true,
+      "showTaskStatusOverlay": true
+    }
+  }
+}
+```
+
+Precedence for arcade launch behavior is:
+
+1. CLI flags
+2. Environment variables
+3. User config
+4. Defaults
+
+Environment variables:
+
+```bash
+LOGICSRC_ARCADE=1
+LOGICSRC_ARCADE_GAME=hangman
+LOGICSRC_NO_ARCADE=1
+LOGICSRC_ARCADE_AUTOSTART_SECONDS=15
+```