refine: cleanup remaining whispergate refs, improve docs and TASKLIST formatting

- Fix enableWhispergatePolicyTool → enableDirigentPolicyTool in config schema and example
- Fix whisper-gateway → dirigentway in install script
- Add v0.2.0 changelog entry
- Improve README with scheduling identifier docs and English text
- Clean up plugin README with moderator handoff format docs
- Reformat TASKLIST with cleaner done markers

plugin/openclaw.plugin.json

@@ -20,7 +20,7 @@
       "noReplyProvider": { "type": "string" },
       "noReplyModel": { "type": "string" },
       "enableDiscordControlTool": { "type": "boolean", "default": true },
-      "enableWhispergatePolicyTool": { "type": "boolean", "default": true },
+      "enableDirigentPolicyTool": { "type": "boolean", "default": true },
       "discordControlApiBaseUrl": { "type": "string", "default": "http://127.0.0.1:8790" },
       "discordControlApiToken": { "type": "string" },
       "discordControlCallerId": { "type": "string" },