feat(me): include GitLab base URL in robot meta for URL construction

The `me` dashboard robot output now includes `meta.gitlab_base_url` so
consuming agents can construct clickable issue/MR links without needing
access to the lore config file. The pattern is:
  {gitlab_base_url}/{project}/-/issues/{iid}
  {gitlab_base_url}/{project}/-/merge_requests/{iid}

This uses the new RobotMeta::with_base_url() constructor. The base URL
is sourced from config.gitlab.base_url (already available in the me
command's execution context) and normalized to strip trailing slashes.

robot-docs updated to document the new meta field and URL construction
pattern for the me command's response schema.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/cli/commands/me/mod.rs

@@ -247,7 +247,7 @@ pub fn run_me(config: &Config, args: &MeArgs, robot_mode: bool) -> Result<()> {
 
     if robot_mode {
         let fields = args.fields.as_deref();
-        render_robot::print_me_json(&dashboard, elapsed_ms, fields)?;
+        render_robot::print_me_json(&dashboard, elapsed_ms, fields, &config.gitlab.base_url)?;
     } else if show_all {
         render_human::print_me_dashboard(&dashboard, single_project);
     } else {

src/cli/commands/me/render_robot.rs

@@ -15,11 +15,12 @@ pub fn print_me_json(
     dashboard: &MeDashboard,
     elapsed_ms: u64,
     fields: Option<&[String]>,
+    gitlab_base_url: &str,
 ) -> crate::core::error::Result<()> {
     let envelope = MeJsonEnvelope {
         ok: true,
         data: MeDataJson::from_dashboard(dashboard),
-        meta: RobotMeta { elapsed_ms },
+        meta: RobotMeta::with_base_url(elapsed_ms, gitlab_base_url),
     };
 
     let mut value = serde_json::to_value(&envelope)