test(soul): integration and contract tests for layered_cycle composition
Adds tests/test_layered_cycle.el — 12 integration tests covering the full
L1→L2→L3→L1 stack: benign pass-through, hard-bell short-circuit, soft-bell
care augmentation, steward redirect for all 5 mission-conflict signals, empty
input graceful handling, sequential call isolation, and imprint state stability.
Adds tests/test_layer_contract.el — contract tests verifying the JSON
interface shapes between layers: safety_screen {action, content|reason|concern},
steward_align {action, content|redirect_to}, imprint_respond non-empty String,
and cross-layer action propagation from L1 screen through to L1 validate.
will.anderson
d097455d6a