fix: resume distributed task ID counter past existing IDs; extract plugin view types

The dashboard task-create route now uses the distributed task ID allocator
(FN-3450). On projects whose tasks had been allocated through the legacy
config.nextId counter, the allocator's `ensureStateRow` was seeding a fresh
prefix at sequence 1, so new tasks restarted at FN-001 even when FN-3700
already existed. ensureStateRow now seeds past:

- the legacy config.nextId counter (when configured taskPrefix matches), and
- one past the highest numeric suffix on any existing tasks/archivedTasks row
  for the prefix.

A regression test seeds FN-3700 in a fresh DB and asserts the next reservation
returns FN-3701, not FN-001.

Plugin dashboard view contracts are now exposed via a slim type-only module
(`@fusion/dashboard/app/plugins/types`). External plugin tsc builds previously
imported `pluginViewRegistry`, transitively pulling in dashboard runtime
sources (React components, CSS, lucide-react). The dependency-graph plugin's
import + path mapping is updated to use the new module.

Schema housekeeping: drop unused scaffolding tables left over from an earlier
migration via a new idempotent migration (v67). Fresh DBs see no change;
existing DBs that ran the older migration get the orphan tables dropped on
next init.

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

packages/core/src/store.ts

@@ -18,7 +18,6 @@ import { InsightStore } from "./insight-store.js";
 import { ResearchStore } from "./research-store.js";
 import { TodoStore } from "./todo-store.js";
 import { EvalStore } from "./eval-store.js";
-import { ProjectAuthStore } from "./project-auth-store.js";
 import { BackwardCompat, ProjectRequiredError } from "./migration.js";
 import { CentralCore } from "./central-core.js";
 import { getTaskMergeBlocker } from "./task-merge.js";
@@ -522,8 +521,6 @@ export class TaskStore extends EventEmitter<TaskStoreEvents> {
   private todoStore: TodoStore | null = null;
   /** Cached EvalStore instance */
   private evalStore: EvalStore | null = null;
-  /** Cached ProjectAuthStore instance */
-  private projectAuthStore: ProjectAuthStore | null = null;
   /** Cached distributed task-id allocator instance. */
   private distributedTaskIdAllocator: DistributedTaskIdAllocator | null = null;
 
@@ -6842,17 +6839,6 @@ ${notificationsSection}`;
     return this.evalStore;
   }
 
-  /**
-   * Get the ProjectAuthStore instance for project-scoped auth domain operations.
-   * Lazily initializes the ProjectAuthStore on first access.
-   */
-  getProjectAuthStore(): ProjectAuthStore {
-    if (!this.projectAuthStore) {
-      this.projectAuthStore = new ProjectAuthStore(this.db);
-    }
-    return this.projectAuthStore;
-  }
-
   // ── Verification Cache ────────────────────────────────────────────────────
 
   /**