perf(doi): 13x speedup for /repos/doi/summary (108s → ~6s)

Two fixes:
1. skip_consistency=True in summary mode — omits C7/C13 subprocess calls
   (consistency_check.py) which were the main bottleneck (32 spawns for 16 repos).
   Full check still available per-repo via GET /repos/{slug}/doi.
2. asyncio.gather — all repos evaluated in parallel instead of sequentially.

Also: rename Repositories page title from "Repos" to "Repositories".

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

dashboard/src/repos.md

@@ -1,5 +1,5 @@
 ---
-title: Repos
+title: Repositories
 ---
 
 ```js
@@ -115,7 +115,7 @@ const doiFullCount     = repoRows.filter(r => r._doiTier === "full").length;
 const doiNoneCount     = repoRows.filter(r => r._doiTier === "none").length;
 ```
 
-# Repos
+# Repositories
 
 ```js
 import {withDocHelp} from "./components/doc-overlay.js";