Tell agents about stored git credentials; give Claude Code the user's git config

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

server/src/prompts.rs

@@ -298,6 +298,9 @@ pub fn system_prompt(app: &App, agent: &Agent, root: &Path, cwd: &Path, model: &
             s.push_str(&format!("\n# About the user (personal memory)\n{}\n", memory.trim()));
         }
     }
+    if let Some(git) = owner.and_then(|u| crate::gitcreds::prompt_section(app, &u.id)) {
+        s.push_str(&git);
+    }
     match std::fs::read_to_string(cwd.join(".codecraft").join("memory.md")) {
         Ok(mem) => s.push_str(&format!("\n# Project memory\nFacts learned earlier in this project (keep it current with the remember tool):\n{}\n", mem.chars().take(20_000).collect::<String>())),
         Err(_) if !agent.read_only => s.push_str("\n# Project memory\nWhen you learn something lasting about this project (how to build/test, conventions, pitfalls), save it with the remember tool.\n"),