feat(dashboard): CUST-WP-0019 — Repository nav section, config.js cleanup

T01: Restructure nav — "Repos" → collapsible "Repository" section with
     Repo Sync, SBOM, Debt as sub-pages; Debt moved out of Workstreams
T02: workstream-dod.md migrated from inline const API to config.js import
T03: todo.md suggestion filter (done in previous commit)

Closes CUST-WP-0019. Resolves UI suggestion c2fc284a.

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

dashboard/observablehq.config.js

@@ -22,7 +22,17 @@ export default {
     { name: "Todo",           path: "/todo" },
     // ── Organizational Entity Views ───────────────────────────────────────────
     { name: "Domains", path: "/domains" },
-    { name: "Repos",   path: "/repos" },
+    {
+      name: "Repository",
+      path: "/repos",
+      collapsible: true,
+      open: false,
+      pages: [
+        { name: "Repo Sync", path: "/repo-sync" },
+        { name: "SBOM",      path: "/sbom" },
+        { name: "Debt",      path: "/techdept" },
+      ],
+    },
     { name: "Goals",   path: "/goals" },
     {
       name: "Workstreams",
@@ -33,7 +43,6 @@ export default {
         { name: "Decisions",     path: "/decisions" },
         { name: "Tasks",         path: "/tasks" },
         { name: "Interventions", path: "/interventions" },
-        { name: "Debt",          path: "/techdept" },
         { name: "UI Feedback",   path: "/ui-feedback" },
         { name: "Extends",       path: "/extensions" },
         { name: "Dependencies",  path: "/dependencies" },
@@ -41,8 +50,6 @@ export default {
     },
     // ── Functional Report Views ────────────────────────────────────────────────
     { name: "Contributions", path: "/contributions" },
-    { name: "SBOM",          path: "/sbom" },
-    { name: "Repo Sync",     path: "/repo-sync" },
     { name: "Inbox",         path: "/inbox" },
     { name: "Progress",      path: "/progress" },
     // ── Policy ────────────────────────────────────────────────────────────────

dashboard/src/policy/workstream-dod.md

@@ -3,7 +3,7 @@ title: Workstream Definition of Done
 ---
 
 ```js
-const API = "http://127.0.0.1:8000";
+import {API} from "../components/config.js";
 ```
 
 ```js