feat: task dependency CRUD — create/update deps via CLI and API#2

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0pfleet wants to merge 3 commits intohyperb1iss:mainfrom

0pfleet:feat/task-dependency-crud

Commits on Feb 13, 2026

feat(core): add delete_between() to RelationshipManager

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claude
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feat(api): add dependency mutations to PATCH /tasks/{task_id}

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claude
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feat(cli): wire dependency flags into task create/update commands

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claude
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