test(issue-17): the frozen wrapper literals follow _decided/_exit_for (review agy)

a670ef5 routed the wrapper's sub-status and exit-code decisions through
_decided / _exit_for, but test_tier1_unit G-10 and test_issue5's
test_wrapper_exit_code_mapping_literals_are_frozen still looked for the raw
`_decide sub-status "$sub_rc"` and `_decide exit-code "$job_status"`. They now
pin `_decided job_status sub-status "$sub_rc"` and `_exit_for "$job_status"`.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HCGpJXhSZasJLU38ksDghe

tests/test_tier1_unit.py

@@ -844,7 +844,7 @@ def test_g10_delegate_job_rc3_not_mistaken_for_error(mam_sandbox):
     """G-10: multi-agent-mux-delegate-job maps rc=3 to broker_unavailable and checks disk status.
     Issue #17 item 4: the mapping is lib_py/delegation/wrapper.py's sub_status."""
     delegate_script = mam_sandbox / "skills" / "multi-agent-mux-delegate-job" / "multi-agent-mux-delegate-job"
-    assert '_decide sub-status "$sub_rc"' in delegate_script.read_text()
+    assert '_decided job_status sub-status "$sub_rc"' in delegate_script.read_text()
     from lib_py.delegation import wrapper
     reg = mam_sandbox / "g10-reg"
     reg.mkdir()