docs(community): Add Minecraft redstone guide for Discord

- Translated from Japanese skill.fish guide
- Covers logic gates, clocks, practical circuits
- Formatted for Discord embed or bot command use

Chronicler #73

docs/community/guides/minecraft-redstone-guide.md

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+# Minecraft Redstone Basics Guide
+
+*For Firefrost Gaming community reference*
+
+---
+
+## ⚡ Basic Components
+
+### Power Sources (Signal Sources)
+
+| Item | Strength | Features |
+|------|----------|----------|
+| Redstone Torch | 15 | Always ON |
+| Lever | 15 | ON/OFF toggle |
+| Button | 15 | Temporary (wood 1s, stone 0.5s) |
+| Pressure Plate | 15 | ON when stepped on |
+| Tripwire | 15 | ON when string crossed |
+| Daylight Sensor | 0-15 | Changes with day/night |
+| Observer | 15 | Detects block changes |
+
+### Transmission (Wires)
+
+| Item | Features |
+|------|----------|
+| Redstone Dust | Signal decays over 15 blocks |
+| Repeater | Resets signal, adds delay |
+| Comparator | Compares/subtracts signals |
+
+### Output Devices
+
+| Item | Action |
+|------|--------|
+| Piston | Pushes blocks |
+| Sticky Piston | Pushes & pulls blocks |
+| Door | Opens/closes |
+| Dispenser | Shoots items |
+| Dropper | Drops items |
+| Hopper | Transfers items (stops when OFF) |
+| Lamp | Lights up |
+| TNT | Explodes |
+
+---
+
+## 🔌 Signal Transmission
+
+### Basic Rules
+
+```
+Redstone dust loses signal after 15 blocks:
+[Power] ─────────────→ [Dies at block 15]
+  15   14   13  ...  2    1    0
+
+Extend with repeaters:
+[Power] ─── [Repeater] ─── [Repeater] ───→ Infinite!
+```
+
+### Signal Direction
+
+```
+Dust powers adjacent blocks:
+   ↑
+← ■ →  (■ = block with dust)
+   ↓
+
+Repeaters are one-way only:
+→ [>] →  (fixed direction)
+```
+
+---
+
+## 🧠 Logic Gates
+
+### NOT (Inverter)
+```
+Input → [T] → Output
+        │
+      Block
+```
+T = Redstone Torch  
+Input ON = Torch OFF | Input OFF = Torch ON
+
+### AND (Both ON)
+```
+Input A ─┐
+         ├─ [T] → Output
+Input B ─┘
+```
+Output ON only when **BOTH** inputs are ON
+
+### OR (Either ON)
+```
+Input A ─┬─→ Output
+Input B ─┘
+```
+Output ON when **EITHER** input is ON
+
+### XOR (Exclusive OR)
+- Requires complex circuit
+- Output ON only when **ONE** input is ON (not both)
+
+---
+
+## 🔁 Repeaters
+
+### Functions
+- ⚡ **Signal Extension:** Resets strength to 15
+- ⏱️ **Delay:** 1-4 ticks (0.1-0.4 seconds)
+- ➡️ **One-way:** No backflow
+- 🔒 **Lock:** Side signal locks it
+
+### Delay Settings
+Right-click to cycle:
+```
+1 tick → 2 tick → 3 tick → 4 tick → 1 tick...
+```
+
+---
+
+## ⚖️ Comparators
+
+### Compare Mode (front torch OFF)
+- Back ≥ Side → outputs back signal
+- Back < Side → no output
+
+### Subtract Mode (front torch ON)
+- Back - Side = Output
+
+### Container Reading
+```
+[Chest] → [Comparator] → Signal (0-15)
+```
+Signal strength = how full the chest is
+
+---
+
+## ⏰ Clock Circuits
+
+### Repeater Clock
+```
+[Repeater]→[Repeater]→[Repeater]
+      ↑                       │
+      └───────────────────────┘
+```
+Adjust speed with repeater count & delay
+
+### Observer Clock (Fast)
+```
+[Observer]⇔[Observer]
+```
+Face toward each other = high-speed clock
+
+### Hopper Clock (Slow)
+```
+[Hopper]⇔[Hopper]
+     ↓
+[Comparator]
+```
+Adjust speed with number of items
+
+---
+
+## 🏗️ Practical Circuits
+
+### Auto Door
+```
+[Pressure Plate] → [Piston/Door]
+```
+Opens when stepped on
+
+### Hidden Door (2x2 Piston)
+```
+      [P][P]
+Lever→[P][P]
+```
+
+### Item Elevator
+```
+[Dropper]
+    ↑
+[Dropper]
+    ↑
+[Hopper]
+```
+Clock signal moves items upward
+
+### Auto Furnace
+```
+[Chest]→[Hopper]→[Furnace]→[Hopper]→[Chest]
+  Raw                           Finished
+  
+           [Hopper]
+              ↓
+           [Chest]
+            Fuel
+```
+
+### T Flip-Flop
+Press once = ON, press again = OFF
+```
+        [Dropper]
+            ↑↓
+        [Dropper]
+            │
+Button→[Repeater]→[Comparator]→Output
+```
+
+---
+
+## 💡 Tips
+
+### Debugging
+- ✅ Use redstone lamps to check signals
+- ✅ Test sections one at a time
+
+### Delay Math
+- 1 tick = 0.1 seconds
+- Repeater minimum = 1 tick
+- Piston extend + retract = 3 ticks total
+
+### Signal Strength
+- Check dust brightness (brighter = stronger)
+- Use comparator to get exact value
+
+---
+
+## 📖 Glossary
+
+| Term | Meaning |
+|------|---------|
+| tick | Unit of game time (0.05 sec) |
+| BUD | Block Update Detector |
+| 0-tick | Instantaneous signal pulse |
+| QC | Quasi-Connectivity (bug/feature) |
+
+---
+
+*Guide from Firefrost Gaming* 🔥❄️