feat(cli): add move command for moving tasks between projects

[bborn]

Summary

• Adds task move <task-id> <target-project> CLI command to move tasks between projects
• Properly cleans up old task's resources (Claude session, tmux window, worktree) before moving
• Creates a new task in the target project with preserved content

The new task preserves:

• Title, body, type, tags
• Status (unless processing/blocked, which resets to backlog)
• Executor, pinned flag

The new task resets:

• Worktree path, branch name, port
• Claude session ID, daemon session
• Started/completed timestamps

Usage

task move 42 myapp           # Move task #42 to project "myapp"
task move 42 myapp --execute # Move and queue for execution
task move 42 myapp --force   # Skip confirmation prompt

Notes

The TUI already supports this feature when editing a task and changing its project field. This adds the same functionality to the CLI for convenience.

Test plan

• Added unit tests for moveTask function
• All existing tests pass
• Manual testing: create a task in wrong project, move it to correct project

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