refactor: remove turn tools, rename discord tools, rewrite installer

- Remove turn management tools (turn-status/advance/reset) — internal only,
  accessible via /dirigent slash commands
- Rename discord tools: dirigent_discord_channel_create,
  dirigent_discord_channel_update, dirigent_discord_member_list
- Rewrite install script:
  - Dynamic OpenClaw dir resolution (OPENCLAW_DIR env → openclaw CLI → ~/.openclaw)
  - Plugin installed to $(openclaw_dir)/plugins/dirigent
  - New --update mode: git pull from latest branch + reinstall
  - Cleaner uninstall: removes installed plugin files
- Update docs (FEAT.md, README.md, CHANGELOG.md, TASKLIST.md)

TASKLIST.md

@@ -41,16 +41,14 @@
 
 ## 6) Split dirigent_tools into Individual Tools ✅
 - **Before**: Single `dirigent_tools` tool with `action` parameter managing 9 sub-actions.
-- **After**: 9 individual tools, each with focused parameters:
-  - `dirigent_channel_create` — Create private Discord channel
-  - `dirigent_channel_update` — Update channel permissions
-  - `dirigent_member_list` — List guild members
+- **After**: 6 individual tools (Discord tools prefixed `dirigent_discord_*`):
+  - `dirigent_discord_channel_create` — Create private Discord channel
+  - `dirigent_discord_channel_update` — Update channel permissions
+  - `dirigent_discord_member_list` — List guild members
   - `dirigent_policy_get` — Get all channel policies
   - `dirigent_policy_set` — Set/update a channel policy
   - `dirigent_policy_delete` — Delete a channel policy
-  - `dirigent_turn_status` — Show turn status
-  - `dirigent_turn_advance` — Manually advance turn
-  - `dirigent_turn_reset` — Reset turn order
+- Turn management (status/advance/reset) NOT exposed as tools — purely internal plugin logic, accessible via `/dirigent` slash commands.
 - Shared Discord API helper `executeDiscordAction()` extracted to reduce duplication.
 - **Done**: All tools registered individually with specific parameter schemas.