fix(task-system): sync blocks when adding blockedBy dependencies

[folook]

Summary

This fixes an inconsistency in TaskManager.update() dependency synchronization.

Previously:

• addBlocks updated both sides of the relationship
• addBlockedBy only updated the current task's blockedBy

This could leave blocks and blockedBy out of sync.

Change

When calling TASKS.update(task_id, add_blocked_by=[...]), the task manager now also updates each blocker task's blocks list, making dependency
synchronization bidirectional.

Example

Before:

• TASKS.update(3, add_blocked_by=[2])
• Task 3 would get blockedBy: [2]
• Task 2 would not get blocks: [3]

After:

• Task 3 gets blockedBy: [2]
• Task 2 also gets blocks: [3]

Validation

Verified with a minimal task setup that calling:

TASKS.update(3, add_blocked_by=[2])

updates both:

- task 3 blockedBy
- task 2 blocks

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