diff --git a/packages/loopover-miner/lib/migrate-cli.ts b/packages/loopover-miner/lib/migrate-cli.ts
index 62a5309217..e71ce66304 100644
--- a/packages/loopover-miner/lib/migrate-cli.ts
+++ b/packages/loopover-miner/lib/migrate-cli.ts
@@ -60,14 +60,7 @@ const STORES: MigrateStoreDescriptor[] = [
   { name: "plan-store", resolveDbPath: resolvePlanStoreDbPath, open: openPlanStore },
   { name: "governor-state", resolveDbPath: resolveGovernorStateDbPath, open: openGovernorState },
   { name: "attempt-log", resolveDbPath: resolveAttemptLogDbPath, open: initAttemptLog },
-  {
-    name: "replay-snapshot",
-    // resolveReplaySnapshotDbPath's own (not-yet-converted) .d.ts types `env` as `NodeJS.ProcessEnv`, unlike
-    // every sibling resolver here (`Record<string, string | undefined>`) -- a pre-existing inconsistency, not
-    // introduced by this batch. process.env genuinely satisfies both shapes at runtime, so this cast is safe.
-    resolveDbPath: resolveReplaySnapshotDbPath as (env?: Record<string, string | undefined>) => string,
-    open: openReplaySnapshotStore,
-  },
+  { name: "replay-snapshot", resolveDbPath: resolveReplaySnapshotDbPath, open: openReplaySnapshotStore },
   {
     name: "worktree-allocator",
     resolveDbPath: resolveWorktreeAllocatorDbPath,
diff --git a/packages/loopover-miner/lib/status.ts b/packages/loopover-miner/lib/status.ts
index f97b64bf72..d2d9a56955 100644
--- a/packages/loopover-miner/lib/status.ts
+++ b/packages/loopover-miner/lib/status.ts
@@ -399,8 +399,7 @@ function storeIntegrityChecks(env: Record<string, string | undefined>): DoctorCh
     ["plan-store", resolvePlanStoreDbPath(env)],
     ["governor-state", resolveGovernorStateDbPath(env)],
     ["attempt-log", resolveAttemptLogDbPath(env)],
-    // replay-snapshot's .d.ts still types env as ProcessEnv (not yet migrated); cast is lossless.
-    ["replay-snapshot", resolveReplaySnapshotDbPath(env as NodeJS.ProcessEnv)],
+    ["replay-snapshot", resolveReplaySnapshotDbPath(env)],
     ["worktree-allocator", resolveWorktreeAllocatorDbPath(env)],
     ["contribution-profile", resolveContributionProfileCacheDbPath(env)],
     ["policy-verdict-cache", resolvePolicyVerdictCacheDbPath(env)],
diff --git a/test/unit/miner-migrate-cli.test.ts b/test/unit/miner-migrate-cli.test.ts
index 8565ab291f..4d33fbde41 100644
--- a/test/unit/miner-migrate-cli.test.ts
+++ b/test/unit/miner-migrate-cli.test.ts
@@ -9,6 +9,7 @@ import { resolveEventLedgerDbPath } from "../../packages/loopover-miner/lib/even
 import { applySchemaMigrations, BASELINE_SCHEMA_VERSION } from "../../packages/loopover-miner/lib/schema-version.js";
 import { openWorktreeAllocator, resolveWorktreeAllocatorDbPath } from "../../packages/loopover-miner/lib/worktree-allocator.js";
 import { openLaptopStateStore, resolveLaptopStateDbPath } from "../../packages/loopover-miner/lib/laptop-init.js";
+import { openReplaySnapshotStore, resolveReplaySnapshotDbPath } from "../../packages/loopover-miner/lib/replay-snapshot.js";
 
 const roots: string[] = [];
 
@@ -119,6 +120,18 @@ describe("loopover-miner migrate (#4871)", () => {
     expect(again).toMatchObject({ ok: true, status: "up-to-date", versionBefore: BASELINE_SCHEMA_VERSION });
   });
 
+  // REGRESSION (#8642): migrate/status used to cast resolveReplaySnapshotDbPath's env as NodeJS.ProcessEnv
+  // behind a stale "not yet migrated" comment. The resolver already accepts Record<string, string | undefined>
+  // like every sibling — calling it without a cast must still open + report up-to-date for a fresh store.
+  it("REGRESSION (#8642): replay-snapshot migrate open adapter resolves env without a ProcessEnv cast", () => {
+    const env = tempEnv();
+    openReplaySnapshotStore(resolveReplaySnapshotDbPath(env)).close();
+    const row = runMigrateChecks(env).find((result) => result.name === "replay-snapshot");
+    expect(row).toMatchObject({ ok: true, status: "up-to-date" });
+    expect(row?.versionBefore).toBe(row?.versionAfter);
+    expect(row?.versionBefore).toEqual(expect.any(Number));
+  });
+
   it("actually migrates a pre-existing older-schema portfolio-queue file, bumping its stamped version and adding the missing column", () => {
     const env = tempEnv();
     const dbPath = resolvePortfolioQueueDbPath(env);