feat(bot): add manual-share cog forwarding channel messages to #inbox

bot/chorus_bot/cogs/manual_share.py

@@ -0,0 +1,42 @@
+import discord
+from discord.ext import commands
+from chorus_bot.modality_map import modality_for_channel
+from chorus_bot.ping import build_ping_embed
+
+
+class ManualShareCog(commands.Cog):
+    """Watches per-modality channels; forwards any new message as a ping in #inbox."""
+
+    def __init__(self, bot: commands.Bot, config):
+        self.bot = bot
+        self.config = config
+
+    @commands.Cog.listener()
+    async def on_message(self, message: discord.Message):
+        if message.author.bot:
+            return
+        if message.channel.id == self.config.inbox_channel_id:
+            return  # inbox itself is not a source channel
+
+        modality = modality_for_channel(message.channel.name)
+        if modality is None:
+            return
+
+        content = message.content or "(attachment only — see original message)"
+        snippet = content if len(content) <= 120 else content[:117] + "..."
+
+        embed = build_ping_embed(
+            modality=modality,
+            sender_id=None,
+            snippet=snippet,
+            raw_content=content,
+            captured_at=message.created_at,
+        )
+
+        inbox = self.bot.get_channel(self.config.inbox_channel_id)
+        role_mention = f"<@&{self.config.triage_role_id}>"
+        await inbox.send(content=role_mention, embed=embed)
+
+
+async def setup(bot: commands.Bot, config):
+    await bot.add_cog(ManualShareCog(bot, config))