feat: update Copilot instructions for Discord.js 15.0.0-dev and enhance validation steps

.github/prompts/discord-api-expert.prompt.md

@@ -1,15 +0,0 @@
-# Prompt: Discord.js + Discord API Expert Mode
-
-Whenever assisting with Discord.js or the Discord API:
-
-- Always prioritize information from:
-    - https://discordjs.guide
-    - https://github.com/discordjs/discord.js
-    - https://github.com/discordjs/discord-api-types
-    - https://discord.com/developers/docs/intro
-- If documentation is incomplete, check the installed dependency in `node_modules`.
-- Assume **June 2025 or later** as the baseline for accuracy:
-    - Do not suggest outdated methods, deprecated classes, or old APIs.
-    - Always check whether new features or breaking changes have been introduced after this date.
-- If uncertain, clearly state that and recommend verifying with the official docs or GitHub repo.
-- Always include direct links to relevant official documentation sections.

.github/prompts/discord-helper.prompt.md

@@ -1,14 +0,0 @@
-# Prompt: Discord.js Expert Mode (Post-June 2025)
-
-Whenever assisting with Discord.js or related dependencies:
-
-- Always check official resources:
-    - https://discordjs.guide
-    - https://github.com/discordjs/discord.js
-    - https://github.com/discordjs/discord-api-types
-- If documentation is unclear or outdated, inspect the installed package in `node_modules` to verify the actual available methods and classes.
-- Treat **June 2025** as the minimum reference point:
-    - Never suggest code, methods, or patterns deprecated before June 2025.
-    - Always verify if there are new APIs, breaking changes, or version updates after this date.
-- Prefer official sources and repositories over blogs, tutorials, or old answers.
-- Always mention if information may be outdated and link to the package’s GitHub or changelog for verification.

.github/prompts/discord.js-v15-dev.prompt.md

@@ -0,0 +1,11 @@
+# Prompt: Discord.js 15 Development Mode
+
+When assisting with Discord.js version `15.0.0-dev.1759363313-f510b5ffa`:
+
+- Treat the installed code in `node_modules/discord.js` as the primary and most reliable reference.
+- Always analyze the file `example.ts.txt` to extract API patterns, since it reflects the intended usage of this dev version.
+- Do not rely blindly on official docs or the guide; use them only to compare and note differences with the dev version.
+- Highlight when functionality has changed from v14 to v15, based on observed code and `example.ts.txt`.
+- Encourage verification by:
+  ```bash
+  npx tsc --noEmit

.github/prompts/error-strict.prompt.md

@@ -0,0 +1,28 @@
+# Prompt: TypeScript Strict Error Resolver
+
+Whenever Copilot generates or modifies code:
+
+1. **Never ignore compiler errors** like `TS2339`, `TS2345`, or similar.
+    - Always explain what the error means in plain language.
+    - Always suggest at least one concrete fix.
+
+2. **For missing properties or methods (e.g. `TS2339`)**:
+    - Check if the method exists in the installed `node_modules`.
+    - If it doesn’t exist, assume the API changed in `discord.js@15-dev`.
+    - Propose alternatives based on actual available methods (`example.ts.txt` must be consulted).
+
+3. **For type mismatches (e.g. `TS2345`)**:
+    - Suggest code changes that handle `null`/`undefined` safely.
+    - Show how to cast or coerce types **without breaking strict typing**.
+
+4. **Validation step**:
+    - Always remind to rerun:
+      ```bash
+      npx tsc --noEmit
+      ```
+      until the project compiles cleanly.
+    - Do not consider the task “done” if compiler errors remain.
+
+5. **Explicitness**:
+    - Always specify: “This code suggestion resolves TS2339 / TS2345.”
+    - Never produce a code snippet that still triggers the same error.  

.github/prompts/resource-checker.prompt.md

@@ -1,41 +0,0 @@
-# Prompt: Node.js Resource Checker (Memory & CPU)
-
-Whenever Copilot generates, modifies, or reviews code in Node.js:
-
-1. **Memory Monitoring**
-    - Always remind to check memory usage with:
-      ```js
-      logger.info(process.memoryUsage());
-      ```
-      which returns RSS, Heap Used, Heap Total, External, and Array Buffers.
-    - If `Heap Used` grows continuously without freeing, suggest potential memory leaks (unreleased timers, listeners, or large cached data).
-    - If `RSS` (Resident Set Size) is unusually higher than `Heap Total`, warn that external/native modules might be consuming memory.
-
-2. **CPU Usage**
-    - Remind to check CPU load using:
-      ```bash
-      top -p <pid>
-      ```
-      or Node.js profiling (`--inspect`, `clinic flame`).
-    - Flag infinite loops, synchronous blocking calls, or heavy computations running on the main thread as potential CPU overuse.
-    - Encourage offloading heavy tasks to Workers, child processes, or queues when appropriate.
-
-3. **Best Practices**
-    - Always validate memory and CPU usage after implementing new features.
-    - Suggest garbage collection checks (`global.gc()`) in development when Node is run with `--expose-gc`.
-    - Warn if long-living references (e.g., large Maps, Sets, caches, or listeners) might not be released.
-    - Highlight that CPU and memory efficiency are as important as correctness.
-
-4. **Output Analysis**
-    - When given memory stats like:
-      ```
-      RSS: 186.9MB
-      Heap Used: 67.6MB
-      Heap Total: 71.2MB
-      External: 5.0MB
-      ```
-        - Compare `Heap Used` vs `Heap Total`: if close to the limit, risk of OOM.
-        - Compare `RSS` vs `Heap Total`: if RSS is much larger, check for native module or buffer leaks.
-        - If growth is unbounded, warn about potential memory leaks.
-
-5. **Always remind** to rerun tests with `npx tsc --noEmit` (for type safety) and memory checks together, ensuring both correctness and performance.

.github/prompts/ts-validation.prompt.md

@@ -1,7 +0,0 @@
-# Prompt: TypeScript Validation Mode
-
-Whenever Copilot generates or modifies TypeScript code:
-
-- Immediately remind the user to validate changes by running:
-  ```bash
-  npx tsc --noEmit