ci: chmod +x compiled smoke-test binary before running

paze does not set the executable bit on output ELF/Mach-O, so the
smoke test hit "Permission denied". Add chmod +x so the compiled
hello binary actually executes on both Linux and macOS workflows.

.github/workflows/build-linux.yml

@@ -100,10 +100,12 @@ jobs:
           if [ -f "$BIN/paze" ]; then
             "$BIN/paze" tests/hello.pe --target linux $ARCH_FLAG -o /tmp/hello.elf
             file /tmp/hello.elf
+            chmod +x /tmp/hello.elf
             /tmp/hello.elf || true
           elif [ -f "$BIN/paze.dll" ]; then
             dotnet "$BIN/paze.dll" tests/hello.pe --target linux $ARCH_FLAG -o /tmp/hello.elf
             file /tmp/hello.elf
+            chmod +x /tmp/hello.elf
             /tmp/hello.elf || true
           else
             echo "WARN: paze binary not found, listing bin/:"

.github/workflows/build-macos.yml

@@ -101,11 +101,13 @@ jobs:
           if [ -f "$BIN/paze" ]; then
             "$BIN/paze" tests/hello.pe --target macos $ARCH_FLAG -o /tmp/hello.macos
             file /tmp/hello.macos
+            chmod +x /tmp/hello.macos
             # macOS 上执行编译产物（Mach-O 原生可执行；x64 经 Rosetta 2）
             /tmp/hello.macos || true
           elif [ -f "$BIN/paze.dll" ]; then
             dotnet "$BIN/paze.dll" tests/hello.pe --target macos $ARCH_FLAG -o /tmp/hello.macos
             file /tmp/hello.macos
+            chmod +x /tmp/hello.macos
             /tmp/hello.macos || true
           else
             echo "WARN: paze binary not found, listing bin/:"