Zero delay cycles examples failing in CI tests

[hokeun]

I found this issue when I was reviewing a PR.

These following examples under zero-delay-cycles directory seem to be failing in lff --check tests in the CI:

• /examples/C/src/zero-delay-cycles/CausalityLoop.lf
• /examples/C/src/zero-delay-cycles/Consistency.lf
• /examples/C/src/zero-delay-cycles/ZeroDelayCycle.lf

Here is an example of error messages for the failing tests:

❌ ./examples/C/src/zero-delay-cycles/CausalityLoop.lf
Error: Error: Command failed: lff --check "./examples/C/src/zero-delay-cycles/CausalityLoop.lf"
lff: error: Cyclic dependency due to succeeding reaction. Consider reordering reactions within reactor Controller to avoid causality loop.
 --> examples/C/src/zero-delay-cycles/CausalityLoop.lf:18:3
   |
17 | 
   | >>>>>>>>>>>>>>
18 |   reaction a1(planning) {=
19 |     self->plan = planning->value;
20 |   =}
   | <<<< Cyclic dependency due to succeeding reaction. Consider reordering reactions within reactor Controller to avoid causality loop.
21 | 

lff: error: Reaction triggers involved in cyclic dependency in reactor Controller: planning.
 --> examples/C/src/zero-delay-cycles/CausalityLoop.lf:18:15
   |
17 | 
18 |   reaction a1(planning) {=
   |               ^^^^^^^^ Reaction triggers involved in cyclic dependency in reactor Controller: planning.
   |
19 |     self->plan = planning->value;

lff: error: Cyclic dependency due to preceding reaction. Consider reordering reactions within reactor Controller to avoid causality loop.
 --> examples/C/src/zero-delay-cycles/CausalityLoop.lf:22:3
   |
21 | 
   | >>>>>>>>>>>>>>
22 |   reaction a2(sensor) -> request_for_planning, control {=
23 |     lf_set(request_for_planning, sensor->value);
   | ...
24 |     lf_set(control, self->plan);
25 |   =}
   | <<<< Cyclic dependency due to preceding reaction. Consider reordering reactions within reactor Controller to avoid causality loop.
26 | }

lff: error: Reaction effects involved in cyclic dependency in reactor Controller: request_for_planning, control.
 --> examples/C/src/zero-delay-cycles/CausalityLoop.lf:22:26
   |
21 | 
22 |   reaction a2(sensor) -> request_for_planning, control {=
   |                          ^^^^^^^^^^^^^^^^^^^^ Reaction effects involved in cyclic dependency in reactor Controller: request_for_planning, control.
   |
23 |     lf_set(request_for_planning, sensor->value);

lff: fatal error: Aborting due to 4 previous errors.

❌ ./examples/C/src/zero-delay-cycles/Consistency.lf
Error: Error: Command failed: lff --check "./examples/C/src/zero-delay-cycles/Consistency.lf"
lff: error: Would reformat /home/runner/work/playground-lingua-franca/playground-lingua-franca/examples/C/src/zero-delay-cycles/Consistency.lf
lff: info: Done formatting.

✔️ ./examples/C/src/zero-delay-cycles/Feedback.lf
❌ ./examples/C/src/zero-delay-cycles/ZeroDelayCycle.lf
Error: Error: Command failed: lff --check "./examples/C/src/zero-delay-cycles/ZeroDelayCycle.lf"
lff: error: Would reformat /home/runner/work/playground-lingua-franca/playground-lingua-franca/examples/C/src/zero-delay-cycles/ZeroDelayCycle.lf
lff: info: Done formatting.

You can also check the error messages here: https://github.com/lf-lang/playground-lingua-franca/actions/runs/13189967620/job/36865083693?pr=118