fix(mcu): MCU-N5/C4 — runRadarPulseSequence stops shadowing m/n/y globals

runRadarPulseSequence was redeclaring `int m, n, y` at function scope,
which shadowed the file-scope `uint8_t m, n, y` globals at lines
~190-192 that getStatusString reports to the GUI as
BeamPos|Azimuth|ChirpCount. The function's increments updated only the
locals, then discarded them — so telemetry was permanently frozen at
"BeamPos:1|Azimuth:1|ChirpCount:1" no matter how many beam positions
or revolutions had elapsed.

Fix: drop the three local declarations; the body already references
m/n/y by name, so removing the locals lets the writes hit the globals.
A comment documents the pitfall so the locals do not get re-added by
a future cleanup. Numeric ranges are safe (m_max=32, n_max=31,
y_max=50, all fit in uint8_t).

Test: new standalone test_bug16_runradar_shadows_globals.c reproduces
both the buggy (locals shadow globals) and fixed (globals advance)
patterns and asserts the expected post-sweep values
(g_n=16, g_m=1 wraps each iter, g_y=2 after one revolution).

MCU regression: 76/76 (was 75).

9_Firmware/9_1_Microcontroller/tests/Makefile

@@ -65,6 +65,7 @@ TESTS_MOCK_ONLY := test_bug2_ad9523_double_setup \
 # Tests that are standalone (no mocks needed, pure logic)
 TESTS_STANDALONE := test_bug12_pa_cal_loop_inverted \
                     test_bug13_dac2_adc_buffer_mismatch \
+                    test_bug16_runradar_shadows_globals \
                     test_gap3_iwdg_config \
                     test_gap3_temperature_max \
                     test_gap3_idq_periodic_reread \
@@ -155,6 +156,9 @@ test_bug12_pa_cal_loop_inverted: test_bug12_pa_cal_loop_inverted.c
 test_bug13_dac2_adc_buffer_mismatch: test_bug13_dac2_adc_buffer_mismatch.c
 	$(CC) $(CFLAGS) $< -lm -o $@
 
+test_bug16_runradar_shadows_globals: test_bug16_runradar_shadows_globals.c
+	$(CC) $(CFLAGS) $< -o $@
+
 # Gap-3 safety tests -- mock-only (needs spy log for GPIO sequence)
 test_gap3_emergency_stop_rails: test_gap3_emergency_stop_rails.c $(MOCK_OBJS)
 	$(CC) $(CFLAGS) $(INCLUDES) $< $(MOCK_OBJS) -o $@