Fix (review): seat picker must surface the skill the run resolves

Adversarial review found a display-vs-run mismatch: the seat picker collapses the library to the
first row per key, but ListSkills ordered by version only — so for a key the org authored alongside
a higher-versioned builtin, the picker showed/flagged the builtin while the run injected the org's
own skill. ListSkills now orders the same way the run-time catalog resolves (Published-first,
org-owned-over-builtin, then latest version with the same Ordinal comparison), computed in-memory so
the version tiebreak can't diverge from SkillCatalog. The run itself was already correct; this aligns
what the operator sees with what executes. No client change needed.

SkillRunScopingTests now also asserts the library's first row for a key the org authored is the
org-owned Published row, not the builtin.

Verified: skills test subset 4/4 (full suite green pre-merge).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/Modules/TeamUp.Modules.Skills/Endpoints/SkillsEndpoints.cs

@@ -95,10 +95,16 @@ internal static class SkillsEndpoints
             query = query.Where(s => s.Visibility == vis);
         }
 
-        var skills = await query
-            .OrderBy(s => s.SkillKey)
-            .ThenByDescending(s => s.Version)
-            .ToListAsync(ct);
+        // Order so the FIRST row per key is exactly the one the run-time catalog resolves
+        // (SkillCatalog.GetByKeysAsync): a Published row beats a Draft, the org's own beats the
+        // shared builtin, then the latest version — using the same Ordinal version comparison.
+        // The seat picker collapses to the first row per key, so display matches what will run.
+        var skills = (await query.ToListAsync(ct))
+            .OrderBy(s => s.SkillKey, StringComparer.Ordinal)
+            .ThenByDescending(s => s.Status == SkillStatus.Published)
+            .ThenByDescending(s => s.OrganizationId == organizationId)
+            .ThenByDescending(s => s.Version, StringComparer.Ordinal)
+            .ToList();
 
         return Results.Ok(skills.Select(ToSummary).ToList());
     }