chore(ci): exact infra#566 naive sharding emulation

Replaces curated ci-shard gates with an exact emulation of the naive
sharding from ethereum-optimism/infra#566:

1. Discover all 68 test packages on disk (loadGatelessValidators)
2. sort.Strings (Go lexicographic)
3. i % 8 == shardIndex (round-robin)
4. --exclude-gates flake-shake (post-shard, removes 4 packages)

Result: 64 packages across 8 shards (7-9 per shard). This includes
fault-proof tests, external-network tests, and everything else that
the curated shards in #19423 intentionally excluded. The naive approach
has no awareness of test weight or prerequisites.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: smartcontracts

op-acceptance-tests/acceptance-tests.yaml

@@ -211,136 +211,174 @@ gates:
         timeout: 15m
 
   # ============================================================================
-  # CI PARALLEL SHARDS (NAIVE ROUND-ROBIN)
+  # CI PARALLEL SHARDS (NAIVE ROUND-ROBIN — infra#566 emulation)
   # ============================================================================
-  # Emulates the naive sharding from ethereum-optimism/infra#566:
-  # all 46 packages sorted alphabetically, assigned round-robin (i % 8).
-  # Compare wall-clock time against the curated shards in #19423.
+  # Exact emulation of ethereum-optimism/infra#566's naive sharding:
+  #   1. Discover all 68 test packages on disk (loadGatelessValidators)
+  #   2. sort.Strings (Go lexicographic sort)
+  #   3. i % 8 == shardIndex (round-robin assignment)
+  #   4. --exclude-gates flake-shake (post-shard exclusion)
   #
-  # Exclusions match #19423: fault-proof tests, external-network tests,
-  # and flake-shake quarantine packages are not included.
+  # This includes fault-proof tests, external-network tests, etc. — the naive
+  # approach has no awareness of test weight or prerequisites.
   # ============================================================================
 
   - id: ci-shard-0
-    description: "Naive round-robin shard 0/8"
+    description: "Naive round-robin shard 0/8 (infra#566 emulation)"
     tests:
       - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/base
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/depreqres/reqressyncdisabled/elsync
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/batcher/throttling
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/message
-        timeout: 30m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/upgrade-no-supervisor
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/ecotone
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/rules
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/proofs
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/supernode/interop/same_timestamp_invalid
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/sync/multisupervisor_interop
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/isthmus/preinterop
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/safeheaddb_elsync
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync/clsync/gap_clp2p
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync_tester/sync_tester_elsync_multi
         timeout: 20m
 
   - id: ci-shard-1
-    description: "Naive round-robin shard 1/8"
+    description: "Naive round-robin shard 1/8 (infra#566 emulation)"
     tests:
       - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/base/chain
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/depreqres/syncmodereqressync/clsync
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/custom_gas_token
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/prep
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/fjord
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/upgrade-singlechain
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/proofs-singlechain
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/safeheaddb_clsync
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/sync/simple_interop
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/isthmus/preinterop-singlechain
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync/...
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sequencer
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync/elsync/gap_clp2p
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync_tester/sync_tester_ext_el
         timeout: 20m
 
   - id: ci-shard-2
-    description: "Naive round-robin shard 2/8"
+    description: "Naive round-robin shard 2/8 (infra#566 emulation)"
     tests:
       - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/base/conductor
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/ecotone
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/flashblocks
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/reorgs
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/proofs/fpp
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/isthmus
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/upgrade
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/safeheaddb_elsync
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/isthmus/withdrawal_root
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync_tester/sync_tester_e2e
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/supernode
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync/elsync/gap_elp2p
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync_tester/sync_tester_hfs
         timeout: 20m
 
   - id: ci-shard-3
-    description: "Naive round-robin shard 3/8"
+    description: "Naive round-robin shard 3/8 (infra#566 emulation)"
     tests:
       - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/base/deposit
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/fjord
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/depreqres/reqressyncdisabled/clsync
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/seqwindow
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/fusaka
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/isthmus/erc20_bridge
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/proofs/serial
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sequencer
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/upgrade-no-supervisor
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync_tester/sync_tester_elsync
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/jovian/bpo2
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync/elsync/reorg
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync_tester/sync_tester_hfs_ext
         timeout: 20m
 
   - id: ci-shard-4
-    description: "Naive round-robin shard 4/8"
+    description: "Naive round-robin shard 4/8 (infra#566 emulation)"
     tests:
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/batcher/...
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/base/withdrawal/cannon
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/flashblocks
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/depreqres/reqressyncdisabled/divergence
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/smoke
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/contract
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/isthmus/operator_fee
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/proofs/withdrawal
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/supernode
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/upgrade-singlechain
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync_tester/sync_tester_elsync_multi
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/jovian/pectra
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync/follow_l2
         timeout: 20m
 
   - id: ci-shard-5
-    description: "Naive round-robin shard 5/8"
+    description: "Naive round-robin shard 5/8 (infra#566 emulation)"
     tests:
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/custom_gas_token
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/base/withdrawal/cannon_kona
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/fusaka
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/depreqres/reqressyncdisabled/elsync
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/sync/multisupervisor_interop
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/loadtest
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/isthmus/pectra
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/reorgs
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/supernode/interop
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/isthmus/erc20_bridge
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync_tester/sync_tester_hfs
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/proofs/cannon
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/supernode/interop/follow_l2
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync/manual
         timeout: 20m
 
   - id: ci-shard-6
-    description: "Naive round-robin shard 6/8"
+    description: "Naive round-robin shard 6/8 (infra#566 emulation)"
     tests:
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/depreqres/reqressyncdisabled/clsync
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/base/withdrawal/permissioned
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/contract
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/depreqres/syncmodereqressync/clsync
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/sync/simple_interop
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/message
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/isthmus/withdrawal_root
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/seqwindow
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/supernode/interop/follow_l2
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/isthmus/operator_fee
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/rules
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/supernode/interop/reorg
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync_tester/sync_tester_e2e
         timeout: 20m
 
   - id: ci-shard-7
-    description: "Naive round-robin shard 7/8"
+    description: "Naive round-robin shard 7/8 (infra#566 emulation)"
     tests:
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/depreqres/reqressyncdisabled/divergence
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/batcher
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/loadtest
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/prep
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/upgrade
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/interop/smoke
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/jovian/...
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/isthmus/pectra
         timeout: 20m
-      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/supernode/interop/reorg
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/safeheaddb_clsync
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/supernode/interop/same_timestamp_invalid
+        timeout: 20m
+      - package: github.com/ethereum-optimism/optimism/op-acceptance-tests/tests/sync_tester/sync_tester_elsync
         timeout: 20m

op-acceptance-tests/scripts/check-shard-coverage.sh

@@ -20,25 +20,11 @@ MODULE="github.com/ethereum-optimism/optimism/op-acceptance-tests/tests"
 # --- Known exclusions (covered by develop-CI, nightly, or flake-shake) ---
 # If you add a package here, add a comment explaining where it's covered.
 EXCLUDED_PACKAGES=(
-  # Fault-proof tests — covered by develop-CI gates (isthmus, pre-interop, interop)
-  "base/withdrawal/cannon"
-  "base/withdrawal/cannon_kona"
-  "base/withdrawal/permissioned"
-  "isthmus/preinterop"
-  "isthmus/preinterop-singlechain"
-  "interop/proofs"
-  "interop/proofs/fpp"
-  "interop/proofs/serial"
-  "interop/proofs/withdrawal"
-  "interop/proofs-singlechain"
-  "proofs/cannon"
-  # External-network daily tests — covered by sync-test-op-node gate
-  "sync_tester/sync_tester_ext_el"
-  "sync_tester/sync_tester_hfs_ext"
-  # Flake-shake quarantine — temporarily excluded, tracked in flake-shake gate
+  # Flake-shake quarantine — excluded by --exclude-gates flake-shake in infra#566
   "supernode/interop/activation"
   "depreqres/syncmodereqressync/elsync"
   "depreqres/reqressyncdisabled"
+  "supernode/interop"
 )
 
 # --- Find all test packages on disk that contain actual test functions ---