Enable pull_request by default in fabro init

The generated fabro.toml now includes an uncommented [pull_request]
section with enabled=true and draft=true, so new projects auto-create
draft PRs on successful workflow runs out of the box.

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

lib/crates/fabro-cli/src/init.rs

@@ -40,10 +40,10 @@ root = \"fabro/\"
 # Disable retrospective analysis after workflow runs:
 # retro = false
 
-# Auto-create pull requests on successful workflow runs:
-# [pull_request]
-# enabled = true
-# draft = true
+# Auto-create pull requests on successful workflow runs.
+[pull_request]
+enabled = true
+draft = true
 ",
     )
     .with_context(|| format!("failed to write {}", fabro_toml.display()))?;