stop telling agents to git against literal localhost:3000, point at $HIVE_FORGE_URL

hive-agent-mcp/src/mcp/mod.rs

@@ -558,7 +558,7 @@ impl AgentServer {
         default branch gets branch protection so merges require an operator-team approval — you \
         cannot merge your own PRs. `repo` is a single name segment (letters, digits, `-`, `_`, \
         `.`). Returns the new repo's full name + clone URL; clone it over \
-        `http://localhost:3000/agents/<repo>.git` and push/open PRs as normal."
+        `$HIVE_FORGE_URL/agents/<repo>.git` and push/open PRs as normal."
     )]
     async fn create_repo(&self, Parameters(args): Parameters<CreateRepoArgs>) -> String {
         let log = format!("{args:?}");