test(miner): type tempEnv as ProcessEnv for replay-snapshot resolve

validate-code failed: resolveReplaySnapshotDbPath expects NodeJS.ProcessEnv.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: RealDiligent

test/unit/miner-migrate-cli.test.ts

@@ -14,7 +14,7 @@ import { openWorktreeAllocator, resolveWorktreeAllocatorDbPath } from "../../pac
 
 const roots: string[] = [];
 
-function tempEnv() {
+function tempEnv(): NodeJS.ProcessEnv {
   const root = mkdtempSync(join(tmpdir(), "loopover-miner-migrate-"));
   roots.push(root);
   return { LOOPOVER_MINER_CONFIG_DIR: join(root, "state") };