refactor: rebrand npm packages @uncaged/* → @united-workforce/*

Package mapping:
- @uncaged/cli-workflow → @united-workforce/cli
- @uncaged/workflow-protocol → @united-workforce/protocol
- @uncaged/workflow-util → @united-workforce/util
- @uncaged/workflow-util-agent → @united-workforce/util-agent
- @uncaged/workflow-agent-hermes → @united-workforce/agent-hermes
- @uncaged/workflow-agent-claude-code → @united-workforce/agent-claude-code
- @uncaged/workflow-agent-builtin → @united-workforce/agent-builtin
- @uncaged/workflow-dashboard → @united-workforce/dashboard

Changes:
- 8 package.json name + dependency refs
- 82 files: import statements updated
- .changeset/config.json updated
- CLAUDE.md updated
- bunfig.toml restored for preload

CLI command (uwf) and directory names unchanged.

Closes shazhou/united-workforce#8

packages/workflow-util/README.md

@@ -1,4 +1,4 @@
-# @uncaged/workflow-util
+# @united-workforce/util
 
 Shared utilities: encoding, IDs, logging, frontmatter parsing, storage paths, and CLI reference generation.
 
@@ -11,7 +11,7 @@ Layer 1 shared infrastructure used across CLI, agent-kit, and agent packages. Pr
 ## Installation
 
 ```bash
-bun add @uncaged/workflow-util
+bun add @united-workforce/util
 ```
 
 ## API
@@ -114,7 +114,7 @@ import {
   generateUlid,
   getDefaultWorkflowStorageRoot,
   parseFrontmatterMarkdown,
-} from "@uncaged/workflow-util";
+} from "@united-workforce/util";
 
 const log = createLogger();
 log("4KNMR2PX", "Loading workflow...");