feat: add user skill — CLI guide with quick start and typical workflows

Adds 'uwf skill user' command for agents/humans using the uwf CLI.
Covers setup, workflow management, thread lifecycle, step operations,
CAS queries, logging, and global options with a Quick Start guide.

Refs #538

packages/cli-workflow/src/cli.ts

@@ -22,6 +22,7 @@ import {
   cmdSkillCli,
   cmdSkillList,
   cmdSkillModerator,
+  cmdSkillUser,
   cmdSkillYaml,
 } from "./commands/skill.js";
 import { cmdStepFork, cmdStepList, cmdStepRead, cmdStepShow } from "./commands/step.js";
@@ -518,6 +519,13 @@ skill
     console.log(cmdSkillModerator());
   });
 
+skill
+  .command("user")
+  .description("Print the user reference (CLI guide + typical workflows)")
+  .action(() => {
+    console.log(cmdSkillUser());
+  });
+
 skill
   .command("list")
   .description("List all available skill names")