fix(scripts): complete fixture migration diagnostics

scripts/session-fixture-layout.spec.ts

@@ -49,4 +49,9 @@ describe('canonicalSessionFixture', () => {
     expect(() => canonicalSessionFixture(`${HEADER}\n{not-json}\n`, 'broken.jsonl'))
       .toThrow(/broken\.jsonl:2: invalid JSON/)
   })
+
+  it('labels malformed packed rows with the fixture path and line', () => {
+    expect(() => canonicalSessionFixture(`${HEADER}\n{"type":"text-chunks"}\n`, 'broken.jsonl'))
+      .toThrow(/broken\.jsonl:2: invalid session storage record: malformed text-chunks storage row/)
+  })
 })

scripts/session-fixture-layout.ts

@@ -41,7 +41,15 @@ function isSessionHeader(value: unknown): boolean {
 }
 
 function decodeBody(lines: readonly RecordLine[], label: string): SessionEvent[] {
-  return lines.flatMap(line => decodeStorageRecord(parseRecord(line, label)))
+  return lines.flatMap((line) => {
+    const record = parseRecord(line, label)
+    try {
+      return decodeStorageRecord(record)
+    } catch (error) {
+      const detail = error instanceof Error ? error.message : String(error)
+      throw new Error(`${label}:${line.line}: invalid session storage record: ${detail}`, { cause: error })
+    }
+  })
 }
 
 function renderFixture(headerLine: string, events: readonly SessionEvent[]): string {