chore: reorganize repo — legacy packages to legacy-packages/, templates to examples/

- Move 15 old workflow-* packages to legacy-packages/ (inactive, preserved for reference)
- Rename templates/ → examples/ for clarity
- Rewrite docs/architecture.md to reflect current uwf architecture
- Active packages remain in packages/: cli-uwf, uwf-agent-hermes, uwf-agent-kit, uwf-moderator, uwf-protocol, workflow-util

小橘 🍊（NEKO Team）

packages/workflow-protocol/README.md

@@ -1,29 +0,0 @@
-# @uncaged/workflow-protocol
-
-Shared workflow types, sentinel constants, and `Result` helpers.
-
-## What This Package Does
-
-It defines the cross-package contract for bundles and the engine: thread/step shapes, `WorkflowFn`, agent/extract contexts, descriptor types, and `CasStore` as an interface. Implementations (CAS store, CLI, extract) depend on these types so bundles stay decoupled from Node APIs.
-
-## Key Exports
-
-From `src/index.ts`:
-
-- **Types:** `Result`, `CasStore`, `WorkflowRoleSchema`, `WorkflowRoleDescriptor`, `WorkflowDescriptor`, `RoleMeta`, `RoleOutput`, `StartStep`, `RoleStep`, `ThreadContext`, `ModeratorContext`, `AgentContext`, `ExtractContext`, `WorkflowCompletion`, `WorkflowResult`, `LlmProvider`, `ProviderConfig`, `ResolvedModel`, `WorkflowConfig`, `ExtractFn`, `AgentFn`, `AgentBinding`, `WorkflowRuntime`, `WorkflowFn`, `RoleDefinition`, `Moderator`, `WorkflowDefinition`, `AdvanceOutcome`
-- **Constants:** `START`, `END`
-- **Functions:** `ok`, `err`
-
-## Dependencies
-
-- **Peer:** `zod` ^4 — used in type positions for schemas (`ExtractFn`, `RoleDefinition`, etc.)
-
-No workspace packages; this is the bottom layer.
-
-## Usage
-
-```typescript
-import { END, START, type WorkflowFn, type ThreadContext } from "@uncaged/workflow-protocol";
-```
-
-Concrete `WorkflowFn` implementations are built with `@uncaged/workflow-runtime` (`createWorkflow`).