Add Coordinator Mode v0.4 dispatch planning UX

[SetraTheXX]

Summary

Adds v0.4 manual dispatch UX helpers for Coordinator Mode.

Added

• cewp run dispatch plan
• cewp run dispatch check
• cewp run dispatch prompts
• cewp run dispatch start --dry-run

Safety

• No Codex process spawning
• No codex exec
• No terminal automation
• No auto merge
• No auto push
• No publish/release automation
• dispatch start is dry-run only
• User approval gate remains required

Verification

• Local CLI smoke passed
• Temp repo dispatch UX smoke passed
• Negative tests passed
• npm pack --dry-run passed

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