fix(audit): expand home paths across phase0 CLI scripts

Apply HOME-based ~ expansion to summarize/drift/prune audit scripts for input/output path flags to match capture behavior and avoid literal ~/ path bugs. Architecture/protocol diagrams reviewed; no updates needed for this path-resolution change.

scripts/check-phase0-baseline-backend-drift.ts

@@ -176,6 +176,17 @@ function formatFreshnessHours(value: number | null): string {
   return `${Math.round(value * 100) / 100}`;
 }
 
+function expandHomePath(pathValue: string): string {
+  if (!pathValue.startsWith('~')) {
+    return pathValue;
+  }
+  const home = process.env.HOME;
+  if (!home) {
+    return pathValue;
+  }
+  return resolve(home, pathValue.slice(1));
+}
+
 async function writeOutput(pathValue: string, output: string): Promise<void> {
   await mkdir(dirname(pathValue), { recursive: true });
   await writeFile(pathValue, `${output}\n`, 'utf8');
@@ -370,7 +381,7 @@ async function main(): Promise<void> {
     return;
   }
 
-  const artifactsDir = resolve(values['artifacts-dir'] ?? 'docs/plans/artifacts');
+  const artifactsDir = resolve(expandHomePath(values['artifacts-dir'] ?? 'docs/plans/artifacts'));
   const backends = parseBackends(values.backend);
   const candidateTag = values.tag
     ? normalizeArtifactTag(values.tag, '--tag')
@@ -388,12 +399,12 @@ async function main(): Promise<void> {
 
   const defaultBaseName = resolve(artifactsDir, `phase0_baseline_live_backend_drift_${reportTag}`);
   const summaryJsonOut = values['summary-json-out']
-    ? resolve(values['summary-json-out'])
+    ? resolve(expandHomePath(values['summary-json-out']))
     : writeDefaultArtifacts
       ? `${defaultBaseName}.json`
       : undefined;
   const summaryMdOut = values['summary-md-out']
-    ? resolve(values['summary-md-out'])
+    ? resolve(expandHomePath(values['summary-md-out']))
     : writeDefaultArtifacts
       ? `${defaultBaseName}.md`
       : undefined;
@@ -497,7 +508,7 @@ async function main(): Promise<void> {
   }
 
   if (values.out) {
-    await writeOutput(resolve(values.out), output);
+    await writeOutput(resolve(expandHomePath(values.out)), output);
   } else {
     process.stdout.write(`${output}\n`);
   }