feat(shelly): optimize dew point ventilation setpoints, duty cycle, and night-window gating

- Raise target humidity setpoints from 40% to 55% with a 2% hysteresis shut-off
- Eliminate 9999-min unlimited runtime bypass and strictly cap bursts at 35 min
- Rebalance duty cycle to 1:1 ratio (35 min run, 35 min cooldown rest)
- Implement Shelly internal RTC time-of-day check to restrict routine drying to 02:00-07:00
- Add delta-T guard requiring spread >= 3.5°C and max 20 min bursts when outside is >8°C colder
- Update AGENTS.md documentation to reflect optimized gates and thresholds

projects/shelly_taupunktluefter/variables.tf

@@ -47,13 +47,13 @@ variable "winter_temp_threshold_out" {
 variable "target_humi_summer" {
   type        = number
   description = "Target indoor relative humidity [%] during warm / summer mode"
-  default     = 40.0
+  default     = 55.0
 }
 
 variable "target_humi_winter" {
   type        = number
   description = "Target indoor relative humidity [%] during cold / winter mode (avoids over-cooling)"
-  default     = 50.0
+  default     = 55.0
 }
 
 variable "urgent_humi_threshold" {
@@ -65,7 +65,7 @@ variable "urgent_humi_threshold" {
 variable "night_window_start_hour" {
   type        = number
   description = "Start hour (0-23) for the optimal dew point drying window"
-  default     = 3
+  default     = 2
 }
 
 variable "night_window_end_hour" {
@@ -77,13 +77,13 @@ variable "night_window_end_hour" {
 variable "max_runtime_minutes" {
   type        = number
   description = "Maximum continuous fan runtime in minutes before enforcing a cooldown pause"
-  default     = 90
+  default     = 35
 }
 
 variable "min_pause_minutes" {
   type        = number
   description = "Minimum rest period in minutes after a ventilation burst to allow thermal/humidity equilibration"
-  default     = 20
+  default     = 35
 }
 
 variable "schaltzeit" {