fix(wrapper): set ORRO_WRAPPER_DELEGATION so the shim suppresses the legacy deprecation warning (#42)

[moonweave]

Summary

• Set ORRO_WRAPPER_DELEGATION=1 in the child environment for ORRO wrapper workflow delegation.
• Keep engine execution delegated to the pinned witnessd-hosted python3 -m orro surface; direct legacy entrypoints retain their warning behavior.
• Add a wrapper checker assertion covering the child environment contract paired with the witnessd shim suppression.

RED log

Before the fix, the focused delegation test failed with KeyError: 'env' because subprocess.run received no child environment.

Verification

• uv run python3 scripts/check_orro_wrapper.py
• uv run python3 scripts/check_orro_repo_contract.py
• uv run python3 scripts/check_orro_assurance_contract_fixtures.py
• uv run python3 scripts/check_no_bidi_controls.py
• All available ORRO self-tests
• git diff --check