Add confirmation prompt or --dry-run flag to CLI publish

[crtahlin]

Description

clawdhub publish publishes immediately without confirmation or preview. Users can't verify what will be published before it goes live.

Current Behavior

npx molthub publish ./my-skill --slug "test"
# Immediately publishes, no confirmation

Suggested Improvements

Option 1: Confirmation prompt

Publishing: test@1.0.0
  - Files: SKILL.md (4.8KB)
  - Tags: stoicism, project-management
  
Proceed? [y/N]

Option 2: --dry-run flag

npx molthub publish ./my-skill --dry-run
# Shows what would be published without actually publishing

Option 3: Preview URL

Preview your skill before publishing:
https://clawhub.ai/preview/abc123

Publish when ready with: npx molthub publish --confirm abc123

Benefits

• Prevents accidental publishes
• Lets users verify content before it's public
• Standard practice for publishing tools (npm, etc.)

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Found during seller flow UX testing