Merge origin/main with local pending work and update AGENTS.md references

- Resolve 14 conflicts from popping local stash on top of origin's
  eed1e88 + 8d3352f doc-comment additions (11 mechanical, plus
  version.rs, DashboardAuthenticatorTests.cs, DashboardGalaxyProjector.cs)
- Fix 4 test files that used AGENTS.md as the repo-root sentinel
  (now use CLAUDE.md, since AGENTS.md was removed in 4731ab5)
- Redirect 10 doc citations from AGENTS.md to the matching gateway.md
  sections (Value Model, Status Model, Security, STA Worker Thread
  Model, gRPC Layer rule, cancellation rule)

Verified: solution build clean, x86 worker build clean, 266/266
gateway tests passing, 121/121 worker tests passing.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/MxGateway.Server/wwwroot/css/dashboard.css

@@ -122,6 +122,33 @@
     border-radius: .375rem;
 }
 
+.api-key-management-grid {
+    display: grid;
+    gap: .75rem;
+    grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
+}
+
+.scope-grid {
+    display: grid;
+    gap: .35rem .75rem;
+    grid-template-columns: repeat(auto-fit, minmax(12rem, 1fr));
+}
+
+.one-time-secret {
+    display: block;
+    overflow-wrap: anywhere;
+    white-space: normal;
+}
+
+.api-key-create-modal {
+    display: block;
+}
+
+.api-key-create-modal .modal-body {
+    max-height: min(70vh, 44rem);
+    overflow-y: auto;
+}
+
 @media (max-width: 700px) {
     .dashboard-content {
         padding: .75rem;