feat(workspaces): scaffold feature

Scaffold the workspaces feature package via pnpm turbo gen feature
(single Workspace entity, getWorkspace use case) and hand-wire the
aggregators: bindAll dispatcher (web-next), core-api app router, and
workspace deps. Release-please registration reverted per the root-only
versioning policy (AGENTS.md, ADR-027 retrofit). Pinned @trpc/server
to the repo-wide 11.16.0 resolution so instanceof TRPCError checks
share one module instance.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016j8z4VHjedXDTjEDNg7qHK

packages/workspaces/src/feature.manifest.ts

@@ -0,0 +1,55 @@
+import { defineFeature } from "@repo/core-shared/conformance";
+
+/**
+ * The workspaces feature's conformance manifest. Drives binding-slot
+ * types in `di/bind-production.ts` and is read by ESLint, the boot
+ * assertion, and the CI drift gate.
+ *
+ * Conventions:
+ * - `mutates: true` for any use case that creates, updates, or deletes state
+ * - `audits` lists every audit event the use case emits (must match calls
+ *   to `auditLog.record(...)` in the factory body — ESLint enforces this)
+ * - `publishes` / `consumes` cover cross-feature events through `IEventBus`
+ */
+export const workspacesManifest = defineFeature({
+  name: "workspaces",
+  requiredCores: [],
+  useCases: {
+    getWorkspace: {
+      mutates: false,
+      audits: [],
+      publishes: [],
+      consumes: [],
+      analyticsEvents: [],
+    },
+  },
+  realtimeChannels: [],
+  jobs: [],
+  // <gen:coverage>
+  // Coverage bands — single source of truth (ADR-020). Read by:
+  //   - vitest.config.ts (test-time thresholds, L0)
+  //   - assertFeatureConformance (boot-time, fails dev/prod on drift)
+  //   - pnpm coverage:diff (cover-the-diff gate, L1)
+  // Edit here; the helper in vitest.config picks up the new numbers.
+  coverage: {
+    bands: {
+      baseline: { statements: 80, branches: 75, functions: 80, lines: 80 },
+      entities: { statements: 100, branches: 100, functions: 100, lines: 100 },
+      "use-cases": {
+        statements: 100,
+        branches: 95,
+        functions: 100,
+        lines: 100,
+      },
+      controllers: {
+        statements: 100,
+        branches: 95,
+        functions: 100,
+        lines: 100,
+      },
+    },
+    mutationTargets: ["entities", "use-cases"],
+  },
+} as const);
+
+export type WorkspacesManifest = typeof workspacesManifest;