feat(ingestion): add progress reporting for status enrichment pipeline

Previously the status enrichment phase (GraphQL work item status fetch)
ran silently — users saw no feedback between "syncing issues" and the
final enrichment summary. For projects with hundreds of issues and
adaptive page-size retries, this felt like a hang.

Changes across three layers:

GraphQL (graphql.rs):
  - Extract fetch_issue_statuses_with_progress() accepting an optional
    on_page callback invoked after each paginated fetch with the
    running count of fetched IIDs
  - Original fetch_issue_statuses() preserved as a zero-cost
    delegation wrapper (no callback overhead)

Orchestrator (orchestrator.rs):
  - Three new ProgressEvent variants: StatusEnrichmentStarted,
    StatusEnrichmentPageFetched, StatusEnrichmentWriting
  - Wire the page callback through to the new _with_progress fn

CLI (ingest.rs):
  - Handle all three new events in the progress callback, updating
    both the per-project spinner and the stage bar with live counts

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

src/gitlab/graphql.rs

@@ -233,6 +233,14 @@ fn is_complexity_or_timeout_error(msg: &str) -> bool {
 pub async fn fetch_issue_statuses(
     client: &GraphqlClient,
     project_path: &str,
+) -> crate::core::error::Result<FetchStatusResult> {
+    fetch_issue_statuses_with_progress(client, project_path, None).await
+}
+
+pub async fn fetch_issue_statuses_with_progress(
+    client: &GraphqlClient,
+    project_path: &str,
+    on_page: Option<&dyn Fn(usize)>,
 ) -> crate::core::error::Result<FetchStatusResult> {
     let mut statuses = std::collections::HashMap::new();
     let mut all_fetched_iids = std::collections::HashSet::new();
@@ -327,6 +335,10 @@ pub async fn fetch_issue_statuses(
             }
         }
 
+        if let Some(cb) = &on_page {
+            cb(all_fetched_iids.len());
+        }
+
         // Pagination
         if !connection.page_info.has_next_page {
             break;