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_issue5_phase1_delegation.py

@@ -386,8 +386,8 @@ def test_wrapper_exit_code_mapping_literals_are_frozen(mam_sandbox):
     wrapper = SKILLS / "multi-agent-mux-delegate-job" / "multi-agent-mux-delegate-job"
     text = wrapper.read_text(encoding="utf-8")
     # Issue #17 item 4: the mapping moved to lib_py/delegation/wrapper.py; the
-    # wrapper reaches it only through `_decide`.
-    for literal in ('_decide sub-status "$sub_rc"', '_decide exit-code "$job_status"', "--sub-rc \"$sub_rc\""):
+    # wrapper reaches it only through `_decide`, via _decided / _exit_for (N2).
+    for literal in ('_decided job_status sub-status "$sub_rc"', '_exit_for "$job_status"', "--sub-rc \"$sub_rc\""):
         assert literal in text, literal
     from lib_py.delegation import wrapper as decide  # no scripts/ shim: the wrapper calls it with -m
     assert decide.EXIT_CODES == {"completed": 0, "error": 1, "timeout": 2, "broker_unavailable": 3, "cancelled": 5}