fix: resolve state-backed strategy work items

[ApexWorm]

Problem

desloppify plan resolve strategy::<id> classifies the strategy ID as a plan-only synthetic item. The workflow resolver removes it from the plan and prints Resolved, but does not resolve the backing state work item, so next can enqueue it again.

Fix

Route strategy:: items through the normal state-backed resolution path. Workflow, triage, and subjective synthetic items retain their existing plan-only handling.

Verification

• python3 -m pytest -q -p no:cacheprovider desloppify/tests/commands/plan/test_plan_overrides_direct.py desloppify/tests/commands/plan/test_workflow_gates.py desloppify/tests/commands/plan/test_strategist.py desloppify/tests/commands/test_queue_order_guard.py desloppify/tests/commands/resolve/test_cmd_resolve.py
• ruff check desloppify/app/commands/plan/override/resolve_helpers.py desloppify/tests/commands/plan/test_plan_overrides_direct.py
• git diff --check