refactor(prompt): rename subcommands and add frontmatter output

- Rename: user→usage-reference, author→workflow-authoring, adapter→adapter-developing
- Remove: developer (content lives in CLAUDE.md)
- All prompts output complete SKILL.md with YAML frontmatter
- Setup instructions simplified: uwf prompt bootstrap > SKILL.md
- Remove all bun references, use pnpm/npm
- Fix CLAUDE.md: fixed→independent versioning
- Delete old reference files (user/author/developer/adapter)

Closes #66

packages/util/src/usage-reference.ts

@@ -0,0 +1,144 @@
+import { VERSION } from "./version.js";
+
+export function generateUsageReference(): string {
+  return `---
+name: uwf-usage
+description: "Guide for using the uwf CLI to manage workflows and threads."
+version: ${VERSION}
+tags: [uwf, workflow, cli, usage]
+---
+
+# Usage Reference
+
+Guide for using the uwf CLI to manage workflows and threads.
+
+## Quick Start
+
+\`\`\`bash
+# 1. Configure provider and model
+uwf setup
+
+# 2. Register a workflow
+uwf workflow add my-workflow.yaml
+
+# 3. Start a thread (creates but does not execute)
+uwf thread start my-workflow -p "Build a login page"
+
+# 4. Execute the thread (runs moderator → agent → extract cycles)
+uwf thread exec <thread-id>          # one step
+uwf thread exec <thread-id> -c 10    # up to 10 steps
+uwf thread exec <thread-id> -c 10 --background  # run in background
+\`\`\`
+
+## Concepts
+
+- **Workflow** — YAML definition with roles and a routing graph; stored as a CAS node
+- **Thread** — A running instance of a workflow; a chain of step nodes in CAS
+- **Step** — One moderator → agent → extract cycle; contains the role's structured output
+- **CAS** — Content-addressable store; every artifact is hashed (XXH64, Crockford Base32)
+
+## Setup
+
+\`\`\`
+uwf setup                                          # interactive wizard
+uwf setup --provider <name> --base-url <url> \\
+           --api-key <key> --model <name>           # non-interactive
+           [--agent <name>]                         # optional default agent
+\`\`\`
+
+Config is stored at \`~/.uwf/config.yaml\`. Override storage root with \`UWF_HOME\`.
+
+## Workflow Commands
+
+\`\`\`
+uwf workflow add <file>            # register from YAML file
+uwf workflow show <id>             # show by name or CAS hash
+uwf workflow list                  # list all registered workflows
+\`\`\`
+
+You can also pass a file path directly to \`uwf thread start\` without registering first.
+
+## Thread Lifecycle
+
+\`\`\`
+uwf thread start <workflow> -p <prompt>            # create thread
+uwf thread exec <thread-id>                        # execute one step
+               [--agent <cmd>]                     # override agent
+               [-c, --count <n>]                   # run n steps
+               [--background]                      # run in background
+uwf thread show <thread-id>                        # show head pointer
+uwf thread list                                    # list all threads
+               [--status <filter>]                 # idle, running, completed, cancelled, active (comma-separated)
+               [--after <thread-id>]               # pagination: after this thread
+               [--before <thread-id>]              # pagination: before this thread
+               [--skip <n>]                        # skip first n results
+               [--take <n>]                        # limit results
+uwf thread read <thread-id>                        # render context as markdown
+               [--quota <chars>]                   # max output chars (default 4000)
+               [--before <step-hash>]              # pagination
+               [--start]                           # include start step
+uwf thread stop <thread-id>                        # stop background execution
+uwf thread cancel <thread-id>                      # cancel and archive thread
+\`\`\`
+
+### Typical Lifecycle
+
+\`\`\`
+start → exec (repeat) → thread reaches $END → auto-completed
+                       → or: cancel to abort
+\`\`\`
+
+## Step Commands
+
+\`\`\`
+uwf step list <thread-id>         # list all steps
+uwf step show <step-hash>         # show step details
+uwf step fork <step-hash>         # fork thread from a step (branch)
+\`\`\`
+
+Forking creates a new thread that shares history up to the fork point — useful for retrying from a known-good state.
+
+## CAS Commands
+
+Use the \`ocas\` CLI for direct CAS operations (\`~/.ocas/\` store, shared with \`uwf\`):
+
+\`\`\`
+ocas get <hash>                 # read a node (type + payload)
+            [--timestamp]          # include timestamp
+ocas put <type-hash> <data>     # store typed JSON, print hash
+ocas has <hash>                 # check existence
+ocas refs <hash>                # list direct references
+ocas walk <hash>                # recursive traversal
+ocas reindex                    # rebuild type index
+ocas schema list                # list schemas
+ocas schema get <hash>          # show schema definition
+\`\`\`
+
+## Log Commands
+
+\`\`\`
+uwf log list                       # list log files
+uwf log show                       # show log entries
+           [--thread <id>]         # filter by thread
+           [--process <pid>]       # filter by process
+           [--date <YYYY-MM-DD>]   # filter by date
+uwf log clean --before <date>      # delete old logs
+\`\`\`
+
+## Global Options
+
+\`\`\`
+uwf --format <json|yaml>           # output format (default: json)
+uwf -V, --version                  # print version
+\`\`\`
+
+## Other Prompt References
+
+For specific scenarios, run the corresponding \`uwf prompt\` command:
+
+| Scenario | Command | When to use |
+|----------|---------|-------------|
+| Writing workflow YAML | \`uwf prompt workflow-authoring\` | Designing roles, conditions, graphs, and edge prompts |
+| Building a new agent adapter | \`uwf prompt adapter-developing\` | Creating a new \`uwf-<name>\` CLI adapter |
+`;
+}