feat: add discord reaction tool

docs/configuration.md

@@ -179,7 +179,8 @@ Configure the Discord bot by setting the bot token and optional gating:
     },
     requireMention: true,                   // require @bot mentions in guilds
     mediaMaxMb: 8,                          // clamp inbound media size
-    historyLimit: 20                        // include last N guild messages as context
+    historyLimit: 20,                       // include last N guild messages as context
+    enableReactions: false                  // allow agent-triggered reactions
   }
 }
 ```

docs/discord.md

@@ -24,6 +24,7 @@ Status: ready for DM and guild text channels via the official Discord bot gatewa
 7. Optional DM allowlist: reuse `discord.allowFrom` with user ids (`1234567890` or `discord:1234567890`). Use `"*"` to allow all DMs.
 8. Optional guild allowlist: set `discord.guildAllowFrom` with `guilds` and/or `users` to gate who can invoke the bot in servers.
 9. Optional guild context history: set `discord.historyLimit` (default 20) to include the last N guild messages as context when replying to a mention. Set `0` to disable.
+10. Optional reactions: set `discord.enableReactions = true` to allow the agent to react to Discord messages via the `clawdis_discord` tool.
 
 Note: Discord does not provide a simple username → id lookup without extra guild context, so prefer ids or `<@id>` mentions for DM delivery targets.
 
@@ -47,7 +48,8 @@ Note: Discord does not provide a simple username → id lookup without extra gui
     },
     requireMention: true,
     mediaMaxMb: 8,
-    historyLimit: 20
+    historyLimit: 20,
+    enableReactions: false
   }
 }
 ```
@@ -57,6 +59,14 @@ Note: Discord does not provide a simple username → id lookup without extra gui
 - `requireMention`: when `true`, messages in guild channels must mention the bot.
 - `mediaMaxMb`: clamp inbound media saved to disk.
 - `historyLimit`: number of recent guild messages to include as context when replying to a mention (default 20, `0` disables).
+- `enableReactions`: allow agent-triggered reactions via the `clawdis_discord` tool (default `false`).
+
+## Reactions
+When `discord.enableReactions = true`, the agent can call `clawdis_discord` with:
+- `action: "react"`
+- `channelId`, `messageId`, `emoji`
+
+Discord message ids are surfaced in the injected context (`[discord message id: …]` and history lines) so the agent can target them.
 
 ## Safety & ops
 - Treat the bot token like a password; prefer the `DISCORD_BOT_TOKEN` env var on supervised hosts or lock down the config file permissions.