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>

workplans/CUST-WP-0019-dashboard-ux-polish.md

@@ -3,7 +3,7 @@ id: CUST-WP-0019
 type: workplan
 title: "State Hub Dashboard — UX Polish"
 domain: custodian
-status: active
+status: done
 owner: custodian
 topic_slug: custodian
 created: "2026-03-18"
@@ -32,7 +32,7 @@ by priority; each is independently deliverable.
 
 ```task
 id: CUST-WP-0019-T01
-status: todo
+status: done
 priority: high
 state_hub_task_id: "d7f0b3db-57d3-42b3-bc2f-1d2c4b7082e5"
 ```
@@ -61,7 +61,7 @@ entry with a section group containing three children. Update any hardcoded
 
 ```task
 id: CUST-WP-0019-T02
-status: todo
+status: done
 priority: low
 state_hub_task_id: "6843fa20-cea2-46ec-9c99-abaf7c561559"
 ```
@@ -80,7 +80,7 @@ values — leave as-is or add named exports like `POLL_SLOW = 30_000` to
 
 ```task
 id: CUST-WP-0019-T03
-status: todo
+status: done
 priority: low
 state_hub_task_id: "4074bace-f977-4b44-bfae-c8691fca2aca"
 ```