chore(zset): drop the proptest regressions the injected rivals wrote

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VdfEGXA7aJ6ftMsCc9PJze

crates/zset/tests/edge.proptest-regressions

@@ -10,5 +10,3 @@ cc d717a61b42263ed743ce993d0dc7755a3effeddf3aeac9aede363a8c1e8af465 # shrinks to
 cc b1f14324a4b9eb1409330b833483f0869a1b8bc54d145245ef8d32b585c54e85 # shrinks to acts = [Poll(1), Pump, Commit([(4, 1)]), Commit([])], cap = 1
 cc 24b3d06547af18b65c1f93abd0294a1012e4b4e3557bc6eb77af3bfe445ffea8 # shrinks to acts = [Commit([]), Poll(1), Pump, LoseForward(1), Commit([(0, 1)]), Commit([]), Pump, Commit([])], cap = 1
 cc dbc0a788d2546c9fdf88d2dd5e2a2df09625873daca1ae59313f1340a0dbd2f3 # shrinks to acts = [Poll(1), Pump, LoseForward(1), Commit([(6, 1)]), Commit([]), Commit([(0, 0)]), Pump, Commit([])], cap = 1
-cc 2b94ff9ad9fcd2263bd37e6856318facb5a0033a8529da8848baff4cea972601 # shrinks to acts = [Commit([(0, 1)]), Poll(1), Pump, RestartSource, Commit([])], cap = 2
-cc 7b098037af1b4ccf063e1d9e9574f339f7fa7b99e7a770450d1afbed9617916c # shrinks to acts = [StepConsumer, Commit([(1, 1)]), RestartSink, Commit([])], cap = 1

crates/zset/tests/edge_net.proptest-regressions

@@ -1,8 +0,0 @@
-# Seeds for failure cases proptest has generated in the past. It is
-# automatically read and these particular cases re-run before any
-# novel cases are generated.
-#
-# It is recommended to check this file in to source control so that
-# everyone who runs the test benefits from these saved cases.
-cc 9a5d5413ebacc680c1744f086331a406815ef5a10dcb70b95a157c4098474d18 # shrinks to acts = [], cap = 2
-cc 0ee260c6da9e8f1d424f277d372cb485a2028f1fea4c77402a331ac7c2c978e6 # shrinks to acts = [Commit([(0, 1)]), Commit([]), Commit([]), Pump, Commit([]), Drop(0, 0)], cap = 1