feat(OMN-13407): carry delegation context pack hash

[jonahgabriel]

Summary

• Adds context_pack and context_pack_hash to the canonical delegation request DTO.
• Carries context_pack_hash on the canonical task-delegated event.
• Adds focused DTO tests for OFF/default and ON/hash cases.

Evidence

• dod_evidence: uv run pytest tests/unit/models/delegation/wire/test_delegation_wire_models.py -q -> 82 passed.
• dod_evidence: pre-commit run --files src/omnibase_core/models/delegation/wire/model_delegation_wire_request.py src/omnibase_core/models/delegation/wire/model_task_delegated_event.py tests/unit/models/delegation/wire/test_delegation_wire_models.py -> passed.

Known gate state

• pre-commit run --all-files is currently red on pre-existing repository-wide validator debt outside this PR's changed files: string-id/version, manual YAML parsing, fallback patterns, hardcoded env constants, local path fixtures, exception-handling comments, and hardcoded harness topics.
• This PR should not be considered fully merge-ready until that prerequisite gate debt is resolved or represented by the owning core gate-fix workstream.

Closeout linkage

• Supports OMN-13407 Phase C finding from docs/evidence/2026-06-21-sea-dogfood/02-cycles/results.md: context_pack_hash absent from delegation request/projection, first failing layer context-assembly.

Summary by CodeRabbit

• New Features
  • Model delegation requests now support context pack injection with stable hash tracking for improved context identification.
  • Task delegation events now include context pack hash identifiers to enable comprehensive tracking of injected context throughout the delegation lifecycle.

Evidence-Source: OCC#2897
Evidence-Ticket: OMN-13407

[coderabbitai]

📝 Walkthrough

Walkthrough

Two delegation wire model classes gain new optional context_pack and/or context_pack_hash string fields (all defaulting to ""). ModelDelegationRequest receives both fields; ModelTaskDelegatedEvent receives context_pack_hash only. Unit tests cover the empty-string defaults and explicit value preservation for both models.

Changes

Context pack fields on delegation wire models

Layer / File(s)	Summary
context_pack fields on ModelDelegationRequest and ModelTaskDelegatedEvent src/omnibase_core/models/delegation/wire/model_delegation_wire_request.py, src/omnibase_core/models/delegation/wire/model_task_delegated_event.py	ModelDelegationRequest gains context_pack: str and context_pack_hash: str (both default ""). ModelTaskDelegatedEvent gains context_pack_hash: str (default ""), with docs indicating empty string means no context pack injected.
Unit tests for defaults and round-trip tests/unit/models/delegation/wire/test_delegation_wire_models.py	TestModelDelegationRequest asserts context_pack_hash defaults to "" and that an explicit context_pack/context_pack_hash pair survives construction. TestModelTaskDelegatedEvent asserts the default "" and that a supplied sha256:ctx hash is preserved on the event DTO.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

🐇 Two little fields hopped into the wire,
A pack and its hash, neat strings to admire.
Empty by default — no context? That's fine!
Set them with sha256: and they'll shine,
The tests all agree, every assertion in line. 🌿

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: adding support for carrying delegation context pack hash through the workflow.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jonah/omn-13407-context-pack-hash-core

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