docs: add taskmaster prd task queue

.taskmaster/README.md

@@ -0,0 +1,27 @@
+# Taskmaster workspace for Amanat PRDs
+
+This docs-side Taskmaster setup tracks the product/security PRDs from the documentation vault.
+
+## Source PRDs
+
+- `prd-mermaid-diagram-rendering-stabilization.md`
+- `prd-platform-audit-remediation-plan-2026-05-24.md`
+- `prd-request-network-migration-and-funds-management.md`
+
+## Usage
+
+From `nick-doc`, developers can use Taskmaster-compatible tooling against `.taskmaster/tasks/tasks.json`.
+
+Common commands, once `task-master-ai` is installed/configured:
+
+```bash
+task-master list
+task-master show 2
+task-master show 3.4
+task-master next
+task-master set-status --id=2.1 --status=in-progress
+```
+
+The Mermaid PRD is already marked `done` because its source PRD records the full parser sweep as passing. The security and migration PRDs are pending implementation.
+
+No API keys are committed here. Configure API keys locally or in MCP/editor config if AI-assisted Taskmaster commands are needed.