fix: a spliced-out test left its tail behind (4295)

Run 7366, in both the lint and unit lanes — one bug wearing two hats:

    NameError: name 'slots' is not defined
    tests/test_worker_lanes.py:278

Rewriting `test_worker_lane_check_constraints` — parametrised over (slots,
cap, ok) — I cut the parametrize decorator and the assertion but left the two
lines after it, which still referenced all three names. `ast.parse` is happy
with that; only running it is not.

Both failures were the same fragment, which is the tell: the lint lane's F821
and the unit lane's NameError are the same fact reported twice.

Checked the rest of today's splices for the same seam rather than fixing only
the one CI named — a module-level undefined-name sweep over all four test
files I rewrote today comes back clean.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LVjrnpQjRgHdvq95rASoiR

tests/test_worker_lanes.py

@@ -273,11 +273,6 @@ def test_the_row_carries_exactly_one_constraint_now():
     for name in constraints:
         assert not name.startswith("ck_worker_lane_ck_"), f"doubled prefix: {name}"
 
-    # Evaluate the same predicates the database will, so the parametrize table
-    # documents what is accepted rather than restating the SQL.
-    satisfied = slots >= 0 and cap >= 0 and slots <= cap
-    assert satisfied is ok
-
 
 # --- what an optional lane tells the operator before it is enabled -----------