feat: add slash commands and context menu command (#16)

## Summary

This PR adds a suite of slash commands and a context menu command to Amari, along with shared utilities and quality improvements across the board.

### New Commands
- **`/create-issue`** — generates a GitHub issue on a specified repo using AI-drafted content (title, description, acceptance criteria)
- **`/create-task`** — creates a task in Naomi's Leantime instance with an AI-drafted description and configurable priority
- **`/onboard-mentee`** — automates the mentorship onboarding flow (GitHub invite, forum thread, role assignment)
- **Forward to Owner** (context menu, message command) — forwards any message to Naomi with action buttons (contributed by @teklu)

### Shared Utilities
- **`src/utils/makeAiRequest.ts`** — a single wrapper around the Anthropic SDK for all AI calls, with Amari's personality prompt baked in and full error handling
- **`src/events/handleInteractionCreate.ts`** — extracted interaction handler (was inline in `index.ts`) to keep complexity under control

### Quality Improvements
- `ephemeral: true` → `flags: [ MessageFlags.Ephemeral ]` (deprecated API removed)
- Full `try/catch` + `logger.error` audit across all modules (`logMenteeJoin`, `checkAchievements`, `processMentorshipRole`, `processGitHubEvent`)
- `deployGlobal.ts` replaced with a static `commands.json` payload for manual registration
- Amari's personality prompt updated to reflect her actual character — warm, observant, and relentlessly caring

### Notes
- `CLIENT_ID` is needed in 1Password at `op://Environment Variables - Naomi/Amari/client id` for the `commands.json` registration call
- The forward-to-owner command (PR #13, contributed by @teklu) is fully preserved with original commit authorship

✨ This PR was created with help from Hikari~ 🌸

Co-authored-by: Naomi Carrigan <commits@nhcarrigan.com>
Co-authored-by: Teklu <tekluabayneh@gmail.com>
Reviewed-on: #16
Co-authored-by: Hikari <hikari@nhcarrigan.com>
Co-committed-by: Hikari <hikari@nhcarrigan.com>

src/index.ts

@@ -10,11 +10,11 @@ import {
   GatewayIntentBits,
   Events,
   Partials,
-  MessageFlags,
 } from "discord.js";
 import { scheduleJob } from "node-schedule";
 import { App } from "octokit";
 import { ids } from "./config/ids.js";
+import { handleInteractionCreate } from "./events/handleInteractionCreate.js";
 import { handleMessageCreate } from "./events/handleMessageCreate.js";
 import { cacheData } from "./modules/cacheData.js";
 import { checkRetroAchievements } from "./modules/checkAchievements.js";
@@ -41,6 +41,7 @@ const githubApp = new App({
   appId:      process.env.GH_CLIENT_ID,
   privateKey: process.env.GH_PRIVATE_KEY.replaceAll("\\n", "\n"),
 });
+
 const octokit = await githubApp.getInstallationOctokit(83_119_105);
 const { data } = await octokit.rest.apps.getAuthenticated();
 await logger.log(
@@ -60,6 +61,7 @@ const amari: Amari = {
     partials: [ Partials.Channel ],
   }),
   github:       octokit,
+  githubApp:    githubApp,
   lastRssItems: {
     freeCodeCamp: null,
     hackerNews:   null,
@@ -87,12 +89,18 @@ amari.discord.once(Events.ClientReady, () => {
   scheduleJob("post progress reminders", "0 9 * * 1-5", async() => {
     await postProgressReminders(amari);
   });
-  setInterval(() => {
-    amari.recentlyActiveChannels = new Set<string>();
-  }, 10 * 60 * 1000);
-  setInterval(() => {
-    void checkRetroAchievements(amari);
-  }, 10 * 60 * 1000);
+  setInterval(
+    () => {
+      amari.recentlyActiveChannels = new Set<string>();
+    },
+    10 * 60 * 1000,
+  );
+  setInterval(
+    () => {
+      void checkRetroAchievements(amari);
+    },
+    10 * 60 * 1000,
+  );
 });
 
 amari.discord.on(Events.MessageCreate, (message) => {
@@ -105,22 +113,7 @@ amari.discord.on(Events.MessageCreate, (message) => {
 
 amari.discord.on(Events.InteractionCreate, (interaction) => {
   void analytics.logGatewayEvent(Events.InteractionCreate, { ...interaction });
-  if (interaction.isButton() && interaction.customId === "resolve") {
-    if (interaction.user.id !== ids.users.naomi) {
-      return void interaction.reply({
-        content: "Who are you????",
-        flags:   [ MessageFlags.Ephemeral ],
-      });
-    }
-    return void interaction.message.delete();
-  }
-  if (interaction.isAutocomplete()) {
-    return void interaction;
-  }
-  return void interaction.reply({
-    content: "What?",
-    flags:   [ MessageFlags.Ephemeral ],
-  });
+  handleInteractionCreate(amari, interaction);
 });
 
 amari.discord.on(Events.ThreadCreate, (thread) => {