Add OLED display, rotary encoder, max-coverage sweep, updated README

- OLED SSD1306 0.96in via SW_I2C (GPIO17=SDA, GPIO18=SCL): boot messages,
  3-page cycling display (status/freq+hops/health), animated wave arcs,
  full-screen notifications on state changes, page dot indicators
- Rotary encoder (GPIO14=CLK, GPIO21=DT) with IRAM ISR: manual page
  navigation, resets 8s auto-advance timer on interaction
- Sweep reworked for zero-gap coverage: deviation 120->380 kHz (CC1101 max),
  dwell 5->3ms, Radio2 steps 47->60; ~1 MHz noise per hop, R1 cycle 75ms,
  R2 cycle 180ms, all target fob frequencies hit multiple times per press
- HW_I2C->SW_I2C revert after confirming SW_I2C more reliable on ESP32-S3
  with custom pins; Wire.begin probing both 0x3C and 0x3D addresses
- README fully rewritten: all pins, parameters, features, architecture,
  troubleshooting, no emoji or unicode box characters

Made-with: Cursor

include/config.h

@@ -36,9 +36,12 @@
 #define DEFAULT_AMP_GAIN_DB   20
 
 // Modulation parameters for jamming
-#define JAM_BITRATE_KBPS 250.0f        // High bitrate = wider noise bandwidth
-#define JAM_FREQ_DEV_KHZ 120.0f        // Wide deviation = covers ~240 kHz per hop
-#define JAM_RX_BW_KHZ 812.0f           // Maximum RX BW
+// Deviation 380 kHz = CC1101 hardware maximum.
+// Carson's rule BW ≈ 2*(380 + 125) ≈ 1010 kHz of noise per hop.
+// With ~1 MHz per hop we get solid overlap between steps and leave no gaps.
+#define JAM_BITRATE_KBPS 250.0f        // 250 kbps → 125 kHz baseband, maximises noise energy
+#define JAM_FREQ_DEV_KHZ 380.0f        // CC1101 max deviation → ~1 MHz noise per hop (was 120)
+#define JAM_RX_BW_KHZ    812.0f        // Maximum RX BW
 
 // Frequency sweep — full coverage of all known car-key-fob sub-GHz bands
 //
@@ -48,9 +51,11 @@
 //   Toyota/Lexus/Scion: 314.98 MHz
 //   Ford/GM/Chrysler/Dodge/Jeep: 315.0 MHz
 //   Linear Delta-3 / LiftMaster: 318.0 MHz
+//
+//   With 1 MHz/hop: 25 steps × 0.83 MHz spacing → solid overlap, 75ms full cycle at 3ms dwell
 #define SWEEP_1_CENTER_MHZ  310.0f
 #define SWEEP_1_SPAN_MHZ    20.0f      // 300–320 MHz
-#define SWEEP_1_STEPS       25         // ~0.83 MHz/step — overlaps 812 kHz RX BW
+#define SWEEP_1_STEPS       25         // 0.83 MHz/step, well within 1 MHz hop bandwidth
 
 // Radio 2 (CC1101 #2) — 390–436 MHz  [CC1101 Band 2: 387–464 MHz]
 //   Chamberlain/LiftMaster: 390.0 MHz
@@ -58,16 +63,25 @@
 //   Somfy RTS / SMC 5326: 433.42 MHz
 //   Global standard (BMW/VW/Audi/Mercedes/Hyundai/Kia…): 433.92 MHz
 //   Nero Radio / some Asian fobs: 434.42 MHz
+//
+//   With 1 MHz/hop: 60 steps × 0.77 MHz spacing → no gaps, 180ms full cycle at 3ms dwell
 #define SWEEP_2_CENTER_MHZ  413.0f
 #define SWEEP_2_SPAN_MHZ    46.0f      // 390–436 MHz
-#define SWEEP_2_STEPS       47         // ~1 MHz/step
+#define SWEEP_2_STEPS       60         // increased from 47 for guaranteed overlap
 
-// How long to dwell on each hop frequency (ms)
-#define SWEEP_DWELL_MS      5
+// Dwell per hop — 3ms balances CC1101 lock time vs cycle speed
+// Full cycle: R1 = 75ms, R2 = 180ms → any target frequency is jammed at least every 180ms
+// Car fob TX window is typically 200–500ms so every transmission gets hit
+#define SWEEP_DWELL_MS      3
 
 // 0.96" SSD1306 OLED display — I2C via SW_I2C (any free GPIO)
 // Wiring: VCC→3V3, GND→GND, SDA→GPIO17, SCL→GPIO18
 #define OLED_SDA_PIN  17
 #define OLED_SCL_PIN  18
 
+// Rotary encoder — dial to cycle OLED pages
+// Wiring: CLK→GPIO14, DT→GPIO21, GND→GND  (both pins use internal pull-ups)
+#define ENC_CLK_PIN   14
+#define ENC_DT_PIN    21
+
 #endif