[Feature Request] Bulk Operations

[MahjongExpert]

Feature Description

Support bulk update/delete operations for multiple tasks.

Use Case

At phase completion, we often need to:

• Mark all completed tasks as archived
• Reassign multiple tasks to different owner
• Delete obsolete tasks

Expected Behavior

# Bulk update by filter
clawteam task bulk-update team --status completed --set-status archived
clawteam task bulk-update team --owner agent1 --set-owner agent2

# Bulk delete
clawteam task bulk-delete team --status archived --before 2026-03-01

# Interactive confirmation
# "This will update 15 tasks. Continue? [y/N]"

Benefits

• Time savings
• Reduce repetitive commands
• Clean up efficiency