fix(ci): cross-platform export-memory test + restore MSRV toolchain pin

- export_memory_dry_run test: assert filename + 'memory' separately instead
  of the 'memory/<file>' literal — Windows prints a backslash separator.
- ci: msrv job pins dtolnay/rust-toolchain@1.88 again (dependabot #17 bumped
  it to @1.100, which installs a non-existent rust 1.100.0 → 404).

Author: Shahinyanm

.github/workflows/ci.yml

@@ -50,7 +50,10 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Install Rust 1.88
-        uses: dtolnay/rust-toolchain@1.100
+        # The action tag IS the toolchain version installed; @1.88 pins MSRV.
+        # (Dependabot bumped this to @1.100 in #17, which tries to install a
+        # non-existent rust 1.100.0 — revert to the real MSRV.)
+        uses: dtolnay/rust-toolchain@1.88
 
       - name: Cache cargo
         uses: Swatinem/rust-cache@v2

crates/tj-cli/tests/cli.rs

@@ -4527,7 +4527,9 @@ fn export_memory_dry_run_prints_path_and_content_no_write() {
         .args(["export-memory", "--task", &task_id, "--dry-run"])
         .assert()
         .success()
-        .stdout(contains(format!("memory/tj-{task_id}-ship-x.md")))
+        // Separator-agnostic: Windows prints `memory\tj-...` not `memory/tj-...`.
+        .stdout(contains(format!("tj-{task_id}-ship-x.md")))
+        .stdout(contains("memory"))
         .stdout(contains("name: ship-x"));
 
     // Nothing written under the sandboxed Claude config dir.