Add Delegation and DelegationTerms structs for tracking work delegation
between work units. This enables the HOP pattern of work flowing down
and credit cascading up.
New types:
- Delegation: Links parent and child work units with delegated_by/to
- DelegationTerms: Optional terms including portion, deadline, credit_share
New functions:
- AddDelegation: Create a delegation relationship
- RemoveDelegation: Remove a delegation relationship
- GetDelegation: Retrieve delegation info for a child work unit
- ListDelegationsFrom: List all delegations from a parent
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>