Gateway bot: proxy commands to active project instead of reading local state

In gateway mode the bot has no local CRDT or project filesystem, so all
bot commands (status, backlog, start, assign, etc.) returned empty or
broken results. Now the gateway bot proxies non-local commands via HTTP
to the active project's /api/bot/command endpoint, which already exists
on every project server.

Only a small set of gateway-local commands (help, ambient, reset, switch)
are still handled directly by the gateway. Everything else is forwarded
automatically, so new commands added in the future will work through the
proxy without additional gateway changes.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/src/chat/transport/matrix/bot/context.rs

@@ -4,7 +4,7 @@ use crate::chat::ChatTransport;
 use crate::chat::timer::TimerStore;
 use crate::http::context::{PermissionDecision, PermissionForward};
 use matrix_sdk::ruma::{OwnedEventId, OwnedRoomId, OwnedUserId};
-use std::collections::{HashMap, HashSet};
+use std::collections::{BTreeMap, HashMap, HashSet};
 use std::path::PathBuf;
 use std::sync::Arc;
 use tokio::sync::Mutex as TokioMutex;
@@ -65,6 +65,10 @@ pub struct BotContext {
     /// In gateway mode: valid project names accepted by the `switch` command.
     /// Empty in standalone mode.
     pub gateway_projects: Vec<String>,
+    /// In gateway mode: mapping of project name → base URL (e.g. `"http://localhost:3001"`).
+    /// Used to proxy bot commands to the active project's `/api/bot/command` endpoint.
+    /// Empty in standalone mode.
+    pub gateway_project_urls: BTreeMap<String, String>,
 }
 
 impl BotContext {
@@ -82,6 +86,46 @@ impl BotContext {
             self.project_root.clone()
         }
     }
+
+    /// Returns `true` if the bot is running in gateway mode.
+    pub fn is_gateway(&self) -> bool {
+        self.gateway_active_project.is_some()
+    }
+
+    /// Return the base URL for the currently active project, if in gateway mode.
+    pub async fn active_project_url(&self) -> Option<String> {
+        let ap = self.gateway_active_project.as_ref()?;
+        let name = ap.read().await.clone();
+        self.gateway_project_urls.get(&name).cloned()
+    }
+
+    /// Proxy a bot command to the active project's `/api/bot/command` endpoint.
+    ///
+    /// Returns the Markdown response from the project server, or an error
+    /// message if the request failed.
+    pub async fn proxy_bot_command(&self, command: &str, args: &str) -> Option<String> {
+        let base_url = self.active_project_url().await?;
+        let url = format!("{base_url}/api/bot/command");
+        let client = reqwest::Client::new();
+        let body = serde_json::json!({
+            "command": command,
+            "args": args,
+        });
+        match client.post(&url).json(&body).send().await {
+            Ok(resp) if resp.status().is_success() => {
+                match resp.json::<serde_json::Value>().await {
+                    Ok(json) => json.get("response").and_then(|v| v.as_str()).map(String::from),
+                    Err(e) => Some(format!("Failed to parse response from project server: {e}")),
+                }
+            }
+            Ok(resp) => Some(format!(
+                "Project server returned HTTP {}: {}",
+                resp.status(),
+                resp.text().await.unwrap_or_default()
+            )),
+            Err(e) => Some(format!("Failed to reach project server at {url}: {e}")),
+        }
+    }
 }
 
 // ---------------------------------------------------------------------------
@@ -135,6 +179,7 @@ mod tests {
             )),
             gateway_active_project: None,
             gateway_projects: vec![],
+            gateway_project_urls: BTreeMap::new(),
         };
         assert_eq!(
             ctx.effective_project_root().await,
@@ -172,6 +217,10 @@ mod tests {
             )),
             gateway_active_project: Some(Arc::clone(&active)),
             gateway_projects: vec!["huskies".into(), "robot-studio".into()],
+            gateway_project_urls: BTreeMap::from([
+                ("huskies".into(), "http://localhost:3001".into()),
+                ("robot-studio".into(), "http://localhost:3002".into()),
+            ]),
         };
         assert_eq!(
             ctx.effective_project_root().await,
@@ -209,6 +258,10 @@ mod tests {
             )),
             gateway_active_project: Some(Arc::clone(&active)),
             gateway_projects: vec!["huskies".into(), "robot-studio".into()],
+            gateway_project_urls: BTreeMap::from([
+                ("huskies".into(), "http://localhost:3001".into()),
+                ("robot-studio".into(), "http://localhost:3002".into()),
+            ]),
         };
 
         assert_eq!(
@@ -255,6 +308,7 @@ mod tests {
             )),
             gateway_active_project: None,
             gateway_projects: vec![],
+            gateway_project_urls: BTreeMap::new(),
         };
         // Clone must work (required by Matrix SDK event handler injection).
         let _cloned = ctx.clone();