diff --git a/tools/ca3-v4-amend/pc1-publish-20261007.sh b/tools/ca3-v4-amend/pc1-publish-20261007.sh
index c133f2f10..9bc5342e9 100755
--- a/tools/ca3-v4-amend/pc1-publish-20261007.sh
+++ b/tools/ca3-v4-amend/pc1-publish-20261007.sh
@@ -35,6 +35,9 @@ case "$STEP" in
   ca4-mb)     $P add --kind run --target ae432dc7 --id run-ca4-pc1-microbench-5090-20261007 --cards-off "nvidia:NVIDIA GeForce RTX 5090" --script tools/ca3-v4-amend/pc1-ca4-microbench.ps1 --timeout-minutes 60 --title "CA4 research: per-block micro-benchmark on the RTX 5090, unlocked and at the 1,300 MHz knee (the card alone)" --expires-hours 36 $DEPLOY ;;
   ca4-packs-kit) $P add --kind fetch --target ae432dc7 --id fetch-ca4-packs-20261007 --file "$KITS/igneum-ca4-packs-20261007.zip" --dir jobs --extract --title "CA4 research: the two prototype classes' packs plus the mx8 control" --expires-hours 36 $DEPLOY ;;
   ca4-packs)  $P add --kind run --target ae432dc7 --id run-ca4-pc1-packs-5090-20261007 --cards-off "nvidia:NVIDIA GeForce RTX 5090" --script tools/ca3-v4-amend/pc1-ca4-packs.ps1 --timeout-minutes 60 --title "CA4 research: the per-load shadow and the int8 tile prototypes against mx8 and sh256x27 on the RTX 5090 (the card alone)" --expires-hours 36 $DEPLOY ;;
+  v5-kit)     $P add --kind fetch --target ae432dc7 --id fetch-ca3-v5-kit-20261007 --file "$KITS/v5kit/packs-ca3-v5-20261007T221001Z.zip" --dir jobs --extract --title "Class v5 kit (the v5 lane, 7f58af97): packs, workers, SHA256SUMS" --expires-hours 36 $DEPLOY ;;
+  v5-amd)     $P add --kind run --target ae432dc7 --id run-ca3-pc1-v5-amd-bench-20261007 --script tools/ca3-v4-amend/pc1-v5-amd-bench-20261007.ps1 --timeout-minutes 12 --title "Class v5 kit fingerprint on the RX 9070 XT (beside the miners; the v5 lane's script)" --expires-hours 36 $DEPLOY ;;
+  v5-arc)     $P add --kind run --target ae432dc7 --id run-ca3-pc1-v5-arc-bench-20261007 --script tools/ca3-v4-amend/pc1-v5-arc-bench-20261007.ps1 --timeout-minutes 12 --title "Class v5 kit fingerprint on an Intel Arc device if PC 1 has one (beside the miners)" --expires-hours 36 $DEPLOY ;;
   amd-g1)     $P add --kind run --target ae432dc7 --id run-ca3-pc1-v4-sub3-amd-g1-20261007 --cards-off amd:gfx1201 --script tools/ca3-v4-amend/pc1-v4-sub3-amd-g1.ps1 --timeout-minutes 45 --title "CA3 PC 1: G1 on the sub-version 3 kit and the AMD ladder on the 9070 XT (the card alone)" --expires-hours 36 $DEPLOY ;;
   family)     $P add --kind run --target ae432dc7 --id run-ca3-pc1-amd-family-20261007-e --cards-off amd:gfx1201 --script tools/ca3-v4-amend/pc1-amd-family-20261007.ps1 --timeout-minutes 20 --title "CA3 PC 1: item 6 family step costs on the 9070 XT (run e, the card alone)" --expires-hours 36 $DEPLOY ;;
   tune-5080)  $P add --kind run --target ae432dc7 --id run-ca3-pc1-ember-5080-20261007 --script tools/ca3-v4-amend/pc1-ember-card.ps1 --timeout-minutes 35 --title "CA3 PC 1: Ember Tune on the RTX 5080 (the installed app tunes the one card)" --expires-hours 36 $DEPLOY ;;
diff --git a/tools/ca3-v4-amend/pc1-v5-amd-bench-20261007.ps1 b/tools/ca3-v4-amend/pc1-v5-amd-bench-20261007.ps1
new file mode 100644
index 000000000..474b13406
--- /dev/null
+++ b/tools/ca3-v4-amend/pc1-v5-amd-bench-20261007.ps1
@@ -0,0 +1,80 @@
+# Class v5 kit bench on PC 1's RX 9070 XT (7 October 2026, docs/design/class-v5-stored-state.md section 13, "the kit:
+# OpenCL (AMD)"): the kit's igneum-worker-opencl.exe (THIS tree's proto-opencl/host.c with the class v5 leaf upload:
+# igneum_build(ds, cache, leaves, nLeaves, nItems), the leaves of leaves.bin checked against the pack's FNV-1a 64 first)
+# runs --bench-pack on the first class v5 pack, proto-cuda/packs-ca3-v5/v5-dn3-epoch0 (program id e5a4ac5978462156, 11
+# leaves under state root 7e37a9fb..., cache FNV 7334fa46e5d972eb), on the gfx1201 device. Expected: the self-test
+# PASS line (cache head, last line and FNV; dataset head, word [268435455] and 64 samples; 96 of 96 vector lanes) and the
+# fingerprint of the 2^24 outputs at base nonce 0 equal to the Metal reading, 82b19cbde8557ea5 (the M5 Max, 7 October
+# 2026, 18:07:09Z). The v4-genesis control pack runs after it so the run has a known class v4 row beside the v5 row.
+# Beside the miners (a correctness and fingerprint gate; the rate row is labelled loaded when the card mines): no card is
+# switched, nothing is posted to the installed app, nothing is built on the PC. Published by the Counter ASIC coordinator
+# only (the PC 1 queue is its); the kit is fetch job $kitId. Every result line starts with RESULT; SUMMARY {json} ends it.
+$ErrorActionPreference = 'Continue'
+$jobName = 'pc1-amd-v5-bench'
+$kitId = $env:IGNEUM_V5_KIT_ID; if (-not $kitId) { $kitId = 'fetch-ca3-v5-kit-20261007' }
+$expected = '82b19cbde8557ea5'
+$started = Get-Date
+function Stamp { (Get-Date).ToUniversalTime().ToString('yyyy-MM-ddTHH:mm:ssZ') }
+function Summary([string] $status, [hashtable] $extra) {
+  $o = [ordered]@{ job = $jobName; status = $status; duration_s = [int]((Get-Date) - $started).TotalSeconds; finished_at = (Stamp) }
+  foreach ($k in $extra.Keys) { $o[$k] = $extra[$k] }
+  'SUMMARY ' + ($o | ConvertTo-Json -Compress -Depth 4)
+}
+"RESULT start $(Stamp) job=$jobName machine=$env:COMPUTERNAME app_version=$env:IGNEUM_APP_VERSION expected_fingerprint=$expected"
+$jobs = Split-Path $env:IGNEUM_JOB_DIR
+$kit = Join-Path $jobs $kitId
+if (-not (Test-Path $kit)) { "RESULT error kit missing at $kit (the fetch job $kitId runs first; republish it after any app update)"; Summary 'failed' @{ error = 'kit missing' }; exit 2 }
+$exe = Join-Path $kit 'bin\windows\igneum-worker-opencl.exe'
+$packs = Join-Path $kit 'packs'
+if (-not (Test-Path $exe)) { "RESULT error worker missing at $exe"; Summary 'failed' @{ error = 'worker missing' }; exit 2 }
+"RESULT worker kit $exe sha256 $((Get-FileHash -Algorithm SHA256 $exe).Hash.ToLower()) bytes $((Get-Item $exe).Length)"
+foreach ($pk in @('v5-dn3-epoch0', 'v4-genesis')) {
+  $d = Join-Path $packs $pk
+  if (-not (Test-Path (Join-Path $d 'kernel_bound.cl'))) { "RESULT error pack $pk missing at $d"; Summary 'failed' @{ error = "pack $pk missing" }; exit 2 }
+  "RESULT pack $pk kernel_bound.cl sha256 $((Get-FileHash -Algorithm SHA256 (Join-Path $d 'kernel_bound.cl')).Hash.ToLower()) program.h sha256 $((Get-FileHash -Algorithm SHA256 (Join-Path $d 'program.h')).Hash.ToLower())"
+}
+$leaves = Join-Path $packs 'v5-dn3-epoch0\leaves.bin'
+if (-not (Test-Path $leaves)) { "RESULT error leaves.bin missing at $leaves (a class v5 pack without its leaves builds nothing)"; Summary 'failed' @{ error = 'leaves missing' }; exit 2 }
+"RESULT leaves $leaves bytes $((Get-Item $leaves).Length) sha256 $((Get-FileHash -Algorithm SHA256 $leaves).Hash.ToLower())"
+# the OpenCL device index of the 9070 XT (the installed worker's list when present: the app's own indices)
+$inst = @("$env:LOCALAPPDATA\Programs\Igneum Miner", "$env:ProgramFiles\Igneum Miner") | Where-Object { Test-Path (Join-Path $_ 'igneum-app.exe') } | Select-Object -First 1
+$listExe = $exe
+if ($inst -and (Test-Path (Join-Path $inst 'igneum-worker-opencl.exe'))) { $listExe = Join-Path $inst 'igneum-worker-opencl.exe' }
+$list = @(& $listExe --list 2>&1 | ForEach-Object { "$_" })
+$list | ForEach-Object { "RESULT list $_" }
+$dev = $null
+foreach ($l in $list) { if ($l -match '^\s*\[(\d+)\].*gfx1201' -and $l -notmatch 'dup') { $dev = [int]$Matches[1]; break } }
+if ($null -eq $dev) { "RESULT error no gfx1201 device in --list (the eGPU is off the bus: the AMD v5 row stays OWED)"; Summary 'failed' @{ error = 'no gfx1201' }; exit 2 }
+"RESULT device $dev gfx1201 (list from $listExe)"
+function Workers { @(Get-CimInstance Win32_Process -Filter "Name = 'igneum-worker-opencl.exe' OR Name = 'igneum-worker-cuda.exe'" -ErrorAction SilentlyContinue | ForEach-Object { "$($_.Name):$($_.ProcessId):[$($_.CommandLine -replace '\s+', ' ')]" }) }
+$w = @(Workers)
+$loaded = ($w | Where-Object { $_ -match "igneum-worker-opencl.*--device\s+$dev(\s|$)" }).Count -gt 0
+"RESULT workers_before $(Stamp) $($w -join ' ')"
+$state = if ($loaded) { 'loaded' } else { 'quiet' }
+"RESULT context card_state=$state (a fingerprint gate: the load changes the rate row, never the bytes)"
+$rows = @{}
+$fpOk = $false
+foreach ($pk in @('v5-dn3-epoch0', 'v4-genesis')) {
+  $d = Join-Path $packs $pk
+  $t0 = Get-Date
+  "RESULT bench $pk start $(Stamp) cmd=igneum-worker-opencl.exe --bench-pack --pack $d --device $dev --batch-log2 24 --batches 5"
+  $out = @(& $exe --bench-pack --pack $d --device $dev --batch-log2 24 --batches 5 2>&1 | ForEach-Object { "$_" })
+  $code = $LASTEXITCODE
+  $secs = [int]((Get-Date) - $t0).TotalSeconds
+  foreach ($l in $out) { if ($l -match '^(pack |class v5|RESULT |FAIL|error|warm-up)') { "RESULT bench $pk out $l" } }
+  $res = $out | Where-Object { $_ -match '^RESULT ' } | Select-Object -Last 1
+  $fp = ''; $mhs = ''; $check = ''
+  if ($res -match 'fingerprint=([0-9a-f]{16})') { $fp = $Matches[1] }
+  if ($res -match 'mhs=([0-9.]+)') { $mhs = $Matches[1] }
+  if ($res -match 'check=(\w+)') { $check = $Matches[1] }
+  $rows[$pk] = [ordered]@{ exit = $code; seconds = $secs; fingerprint = $fp; mhs = $mhs; check = $check; card_state = $state }
+  if ($pk -eq 'v5-dn3-epoch0') {
+    $fpOk = ($fp -eq $expected -and $check -eq 'PASS')
+    "RESULT v5 fingerprint=$fp expected=$expected match=$fpOk check=$check mhs=$mhs card_state=$state exit=$code seconds=$secs $(Stamp)"
+  } else {
+    "RESULT v4-control fingerprint=$fp check=$check mhs=$mhs card_state=$state exit=$code seconds=$secs $(Stamp)"
+  }
+}
+"RESULT workers_after $(Stamp) $((@(Workers)) -join ' ')"
+Summary $(if ($fpOk) { 'done' } else { 'failed' }) @{ expected = $expected; v5 = $rows['v5-dn3-epoch0']; v4_control = $rows['v4-genesis']; device = $dev; kit = $kitId }
+exit $(if ($fpOk) { 0 } else { 1 })
diff --git a/tools/ca3-v4-amend/pc1-v5-arc-bench-20261007.ps1 b/tools/ca3-v4-amend/pc1-v5-arc-bench-20261007.ps1
new file mode 100644
index 000000000..9eaaf8ca9
--- /dev/null
+++ b/tools/ca3-v4-amend/pc1-v5-arc-bench-20261007.ps1
@@ -0,0 +1,86 @@
+# 7 October 2026, the PC 1 queue (the hash lane publishes for the coordinator): the Arc B580 variant of the v5 lane's pc1-amd-v5-bench.ps1
+# (the kit packs-ca3-v5-20261007T221001Z.zip, fetch job fetch-ca3-v5-kit-20261007). The kit's README says no Arc B580 sits on PC 1 or PC 2
+# and the only Arc path needs a driver click, which no PC job may raise; main's word asks for the card's fingerprint anyway, so this
+# variant takes the Intel device BY NAME from the kit worker's --list (Arc, Intel, Battlemage, bmg) and, when the list has none, says so on
+# a RESULT line and exits 3 (the question answered: the card is not on the bus or has no OpenCL platform), nothing else run. Everything else
+# is the AMD script unchanged: beside the miners, no card switch, nothing posted to the app, no prompt.
+# Class v5 kit bench on PC 1's RX 9070 XT (7 October 2026, docs/design/class-v5-stored-state.md section 13, "the kit:
+# OpenCL (AMD)"): the kit's igneum-worker-opencl.exe (THIS tree's proto-opencl/host.c with the class v5 leaf upload:
+# igneum_build(ds, cache, leaves, nLeaves, nItems), the leaves of leaves.bin checked against the pack's FNV-1a 64 first)
+# runs --bench-pack on the first class v5 pack, proto-cuda/packs-ca3-v5/v5-dn3-epoch0 (program id e5a4ac5978462156, 11
+# leaves under state root 7e37a9fb..., cache FNV 7334fa46e5d972eb), on the gfx1201 device. Expected: the self-test
+# PASS line (cache head, last line and FNV; dataset head, word [268435455] and 64 samples; 96 of 96 vector lanes) and the
+# fingerprint of the 2^24 outputs at base nonce 0 equal to the Metal reading, 82b19cbde8557ea5 (the M5 Max, 7 October
+# 2026, 18:07:09Z). The v4-genesis control pack runs after it so the run has a known class v4 row beside the v5 row.
+# Beside the miners (a correctness and fingerprint gate; the rate row is labelled loaded when the card mines): no card is
+# switched, nothing is posted to the installed app, nothing is built on the PC. Published by the Counter ASIC coordinator
+# only (the PC 1 queue is its); the kit is fetch job $kitId. Every result line starts with RESULT; SUMMARY {json} ends it.
+$ErrorActionPreference = 'Continue'
+$jobName = 'pc1-arc-v5-bench'
+$kitId = $env:IGNEUM_V5_KIT_ID; if (-not $kitId) { $kitId = 'fetch-ca3-v5-kit-20261007' }
+$expected = '82b19cbde8557ea5'
+$started = Get-Date
+function Stamp { (Get-Date).ToUniversalTime().ToString('yyyy-MM-ddTHH:mm:ssZ') }
+function Summary([string] $status, [hashtable] $extra) {
+  $o = [ordered]@{ job = $jobName; status = $status; duration_s = [int]((Get-Date) - $started).TotalSeconds; finished_at = (Stamp) }
+  foreach ($k in $extra.Keys) { $o[$k] = $extra[$k] }
+  'SUMMARY ' + ($o | ConvertTo-Json -Compress -Depth 4)
+}
+"RESULT start $(Stamp) job=$jobName machine=$env:COMPUTERNAME app_version=$env:IGNEUM_APP_VERSION expected_fingerprint=$expected"
+$jobs = Split-Path $env:IGNEUM_JOB_DIR
+$kit = Join-Path $jobs $kitId
+if (-not (Test-Path $kit)) { "RESULT error kit missing at $kit (the fetch job $kitId runs first; republish it after any app update)"; Summary 'failed' @{ error = 'kit missing' }; exit 2 }
+$exe = Join-Path $kit 'bin\windows\igneum-worker-opencl.exe'
+$packs = Join-Path $kit 'packs'
+if (-not (Test-Path $exe)) { "RESULT error worker missing at $exe"; Summary 'failed' @{ error = 'worker missing' }; exit 2 }
+"RESULT worker kit $exe sha256 $((Get-FileHash -Algorithm SHA256 $exe).Hash.ToLower()) bytes $((Get-Item $exe).Length)"
+foreach ($pk in @('v5-dn3-epoch0', 'v4-genesis')) {
+  $d = Join-Path $packs $pk
+  if (-not (Test-Path (Join-Path $d 'kernel_bound.cl'))) { "RESULT error pack $pk missing at $d"; Summary 'failed' @{ error = "pack $pk missing" }; exit 2 }
+  "RESULT pack $pk kernel_bound.cl sha256 $((Get-FileHash -Algorithm SHA256 (Join-Path $d 'kernel_bound.cl')).Hash.ToLower()) program.h sha256 $((Get-FileHash -Algorithm SHA256 (Join-Path $d 'program.h')).Hash.ToLower())"
+}
+$leaves = Join-Path $packs 'v5-dn3-epoch0\leaves.bin'
+if (-not (Test-Path $leaves)) { "RESULT error leaves.bin missing at $leaves (a class v5 pack without its leaves builds nothing)"; Summary 'failed' @{ error = 'leaves missing' }; exit 2 }
+"RESULT leaves $leaves bytes $((Get-Item $leaves).Length) sha256 $((Get-FileHash -Algorithm SHA256 $leaves).Hash.ToLower())"
+# the OpenCL device index of the 9070 XT (the installed worker's list when present: the app's own indices)
+$inst = @("$env:LOCALAPPDATA\Programs\Igneum Miner", "$env:ProgramFiles\Igneum Miner") | Where-Object { Test-Path (Join-Path $_ 'igneum-app.exe') } | Select-Object -First 1
+$listExe = $exe
+if ($inst -and (Test-Path (Join-Path $inst 'igneum-worker-opencl.exe'))) { $listExe = Join-Path $inst 'igneum-worker-opencl.exe' }
+$list = @(& $listExe --list 2>&1 | ForEach-Object { "$_" })
+$list | ForEach-Object { "RESULT list $_" }
+$dev = $null
+foreach ($l in $list) { if ($l -match '^\s*\[(\d+)\].*(Arc|Intel|Battlemage|bmg)' -and $l -notmatch 'dup') { $dev = [int]$Matches[1]; break } }
+if ($null -eq $dev) { "RESULT error no Intel Arc device in --list (PC 1 lists: $(($list | ForEach-Object { $_.Trim() }) -join ' ; ')): the Arc B580 is not on PC 1's bus or has no OpenCL platform; the Arc v5 row stays OWED to the card's holder"; Summary 'failed' @{ error = 'no intel arc device'; devices = @($list) }; exit 3 }
+"RESULT device $dev intel-arc (list from $listExe)"
+function Workers { @(Get-CimInstance Win32_Process -Filter "Name = 'igneum-worker-opencl.exe' OR Name = 'igneum-worker-cuda.exe'" -ErrorAction SilentlyContinue | ForEach-Object { "$($_.Name):$($_.ProcessId):[$($_.CommandLine -replace '\s+', ' ')]" }) }
+$w = @(Workers)
+$loaded = ($w | Where-Object { $_ -match "igneum-worker-opencl.*--device\s+$dev(\s|$)" }).Count -gt 0
+"RESULT workers_before $(Stamp) $($w -join ' ')"
+$state = if ($loaded) { 'loaded' } else { 'quiet' }
+"RESULT context card_state=$state (a fingerprint gate: the load changes the rate row, never the bytes)"
+$rows = @{}
+$fpOk = $false
+foreach ($pk in @('v5-dn3-epoch0', 'v4-genesis')) {
+  $d = Join-Path $packs $pk
+  $t0 = Get-Date
+  "RESULT bench $pk start $(Stamp) cmd=igneum-worker-opencl.exe --bench-pack --pack $d --device $dev --batch-log2 24 --batches 5"
+  $out = @(& $exe --bench-pack --pack $d --device $dev --batch-log2 24 --batches 5 2>&1 | ForEach-Object { "$_" })
+  $code = $LASTEXITCODE
+  $secs = [int]((Get-Date) - $t0).TotalSeconds
+  foreach ($l in $out) { if ($l -match '^(pack |class v5|RESULT |FAIL|error|warm-up)') { "RESULT bench $pk out $l" } }
+  $res = $out | Where-Object { $_ -match '^RESULT ' } | Select-Object -Last 1
+  $fp = ''; $mhs = ''; $check = ''
+  if ($res -match 'fingerprint=([0-9a-f]{16})') { $fp = $Matches[1] }
+  if ($res -match 'mhs=([0-9.]+)') { $mhs = $Matches[1] }
+  if ($res -match 'check=(\w+)') { $check = $Matches[1] }
+  $rows[$pk] = [ordered]@{ exit = $code; seconds = $secs; fingerprint = $fp; mhs = $mhs; check = $check; card_state = $state }
+  if ($pk -eq 'v5-dn3-epoch0') {
+    $fpOk = ($fp -eq $expected -and $check -eq 'PASS')
+    "RESULT v5 fingerprint=$fp expected=$expected match=$fpOk check=$check mhs=$mhs card_state=$state exit=$code seconds=$secs $(Stamp)"
+  } else {
+    "RESULT v4-control fingerprint=$fp check=$check mhs=$mhs card_state=$state exit=$code seconds=$secs $(Stamp)"
+  }
+}
+"RESULT workers_after $(Stamp) $((@(Workers)) -join ' ')"
+Summary $(if ($fpOk) { 'done' } else { 'failed' }) @{ expected = $expected; v5 = $rows['v5-dn3-epoch0']; v4_control = $rows['v4-genesis']; device = $dev; kit = $kitId }
+exit $(if ($fpOk) { 0 } else { 1 })