fix: stabilize cross-platform daemon launch

Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>

.github/workflows/_smoke.yml

@@ -239,7 +239,9 @@ jobs:
 
       - name: Smoke test
         shell: msys2 {0}
-        run: scripts/smoke-test.sh ./codebase-memory-mcp.exe
+        run: |
+          SMOKE_TEMP_ROOT="$(cygpath -u "$RUNNER_TEMP")" \
+            scripts/smoke-test.sh ./codebase-memory-mcp.exe
         env:
           SMOKE_DOWNLOAD_URL: http://127.0.0.1:18080
           SMOKE_UPDATE_FIXTURE_DIR: /tmp/smoke-server

.github/workflows/pr.yml

@@ -114,13 +114,18 @@ jobs:
         shell: msys2 {0}
         run: |
           scripts/build.sh CC=clang CXX=clang++
-          SMOKE_DIR="$(mktemp -d)"
+          # MSYS2 /tmp is intentionally shared. The launcher correctly rejects
+          # a bundle below that writable ancestor, so stage in the runner's
+          # account-private native temp directory instead.
+          SMOKE_ROOT="$(cygpath -u "$RUNNER_TEMP")"
+          SMOKE_DIR="$(mktemp -d "$SMOKE_ROOT/cbm-pr-smoke.XXXXXX")"
           trap 'rm -rf "$SMOKE_DIR"' EXIT
           cp build/c/codebase-memory-mcp-launcher.exe \
             "$SMOKE_DIR/codebase-memory-mcp.exe"
           cp build/c/codebase-memory-mcp.exe \
             "$SMOKE_DIR/codebase-memory-mcp.payload.exe"
-          scripts/smoke-test.sh "$SMOKE_DIR/codebase-memory-mcp.exe"
+          SMOKE_TEMP_ROOT="$SMOKE_ROOT" \
+            scripts/smoke-test.sh "$SMOKE_DIR/codebase-memory-mcp.exe"
 
   ci-ok:
     # The one required context (besides dco) — fails unless every PR stage