diff --git a/.gitignore b/.gitignore
index f9bd5f15..eb8fa2f5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,6 +11,7 @@ apps/epiphany-gui/src-tauri/target/
 .epiphany-dogfood/
 .epiphany-heartbeats/
 .epiphany-face/
+.epiphany-rumination/
 state/agent-heartbeats.json
 state/*.msgpack.lock
 state/*.projection.json
diff --git a/state/agent-heartbeats.msgpack b/state/agent-heartbeats.msgpack
index 471de65d..25a206b5 100644
Binary files a/state/agent-heartbeats.msgpack and b/state/agent-heartbeats.msgpack differ
diff --git a/tools/epiphany_ruminate_until.ps1 b/tools/epiphany_ruminate_until.ps1
new file mode 100644
index 00000000..c0290e1a
--- /dev/null
+++ b/tools/epiphany_ruminate_until.ps1
@@ -0,0 +1,81 @@
+param(
+    [string]$Until = "19:00",
+    [string]$Root = (Resolve-Path ".").Path,
+    [int]$IntervalSeconds = 120
+)
+
+$ErrorActionPreference = "Continue"
+Set-Location -LiteralPath $Root
+
+$now = Get-Date
+$target = [datetime]::ParseExact($Until, "HH:mm", $null)
+$target = Get-Date -Year $now.Year -Month $now.Month -Day $now.Day -Hour $target.Hour -Minute $target.Minute -Second 0
+if ($target -le $now) {
+    $target = $target.AddDays(1)
+}
+
+$runId = "perfect-machine-" + $now.ToString("yyyyMMdd-HHmmss")
+$artifactDir = Join-Path $Root ".epiphany-rumination\$runId"
+New-Item -ItemType Directory -Force -Path $artifactDir | Out-Null
+
+$logPath = Join-Path $artifactDir "rumination.log"
+$statusPath = Join-Path $artifactDir "status.json"
+$summaryPath = Join-Path $artifactDir "summary.md"
+
+$env:CARGO_TARGET_DIR = "C:\Users\Meta\.cargo-target-codex"
+
+function Write-Log([string]$Message) {
+    $line = "$(Get-Date -Format o) $Message"
+    Add-Content -LiteralPath $logPath -Value $line
+}
+
+Write-Log "Starting Perfect Machine rumination until $($target.ToString("o"))."
+
+$cycles = 0
+$failures = 0
+
+while ((Get-Date) -lt $target) {
+    $cycles += 1
+    Write-Log "Cycle ${cycles}: heartbeat routine."
+    $cycleArtifactDir = Join-Path $artifactDir ("cycle-{0:D3}" -f $cycles)
+    New-Item -ItemType Directory -Force -Path $cycleArtifactDir | Out-Null
+
+    & cargo run --manifest-path ".\epiphany-core\Cargo.toml" --bin epiphany-heartbeat-store -- routine --store ".\state\agent-heartbeats.msgpack" --artifact-dir $cycleArtifactDir --agent-store ".\state\agents.msgpack" --source "epiphany/perfect-machine-rumination" *> (Join-Path $cycleArtifactDir "routine.out")
+    if ($LASTEXITCODE -ne 0) {
+        $failures += 1
+        Write-Log "Cycle ${cycles}: routine failed with exit code $LASTEXITCODE."
+    } else {
+        Write-Log "Cycle ${cycles}: routine completed."
+    }
+
+    & cargo run --manifest-path ".\epiphany-core\Cargo.toml" --bin epiphany-heartbeat-store -- status --store ".\state\agent-heartbeats.msgpack" *> $statusPath
+    if ($LASTEXITCODE -ne 0) {
+        $failures += 1
+        Write-Log "Cycle ${cycles}: status failed with exit code $LASTEXITCODE."
+    }
+
+    $remaining = ($target - (Get-Date)).TotalSeconds
+    if ($remaining -le 0) {
+        break
+    }
+    Start-Sleep -Seconds ([Math]::Min($IntervalSeconds, [Math]::Max(1, [int]$remaining)))
+}
+
+@"
+# Perfect Machine Rumination
+
+- started: $($now.ToString("o"))
+- finished: $((Get-Date).ToString("o"))
+- target: $($target.ToString("o"))
+- cycles: $cycles
+- failures: $failures
+- artifactDir: $artifactDir
+- log: $logPath
+- latestStatus: $statusPath
+
+This pass repeatedly ran the native heartbeat routine over `state/agent-heartbeats.msgpack`,
+projecting memory resonance, thought lanes, appraisals, reactions, sleep, and dream
+maintenance through the typed Rust/CultCache surface.
+"@ | Set-Content -LiteralPath $summaryPath -Encoding UTF8
+
+Write-Log "Completed Perfect Machine rumination with $cycles cycles and $failures failures."