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/events/handleInteractionCreate.ts

@@ -0,0 +1,85 @@
+/**
+ * @copyright NHCarrigan
+ * @license Naomi's Public License
+ * @author Naomi Carrigan
+ */
+
+import {
+  MessageFlags,
+  type ChatInputCommandInteraction,
+  type Interaction,
+} from "discord.js";
+import { createIssue } from "../commands/createIssue.js";
+import { createTask } from "../commands/createTask.js";
+import { forwardToOwner } from "../commands/forwardToOwner.js";
+import { onboardMentee } from "../commands/onboardMentee.js";
+import { ids } from "../config/ids.js";
+import type { Amari } from "../interfaces/amari.js";
+
+/**
+ * Routes a chat input command to the appropriate handler.
+ * @param amari -- Amari's instance.
+ * @param interaction -- The incoming slash command to dispatch.
+ */
+const handleChatInputCommand = (
+  amari: Amari,
+  interaction: ChatInputCommandInteraction,
+): void => {
+  const { commandName } = interaction;
+  if (commandName === "onboard-mentee") {
+    void onboardMentee(amari, interaction);
+    return;
+  }
+  if (commandName === "create-task") {
+    void createTask(interaction);
+    return;
+  }
+  if (commandName === "create-issue") {
+    void createIssue(interaction);
+  }
+};
+
+/**
+ * Handles the interaction create event from Discord.
+ * Bootstraps all of our custom interaction logic.
+ * @param amari -- Amari's instance.
+ * @param interaction -- The incoming Discord gateway event to dispatch.
+ */
+export const handleInteractionCreate = (
+  amari: Amari,
+  interaction: Interaction,
+): void => {
+  if (
+    interaction.isMessageContextMenuCommand()
+    && interaction.commandName === "Forward to Naomi"
+  ) {
+    void forwardToOwner(interaction);
+    return;
+  }
+
+  if (interaction.isButton() && interaction.customId === "resolve") {
+    if (interaction.user.id !== ids.users.naomi) {
+      void interaction.reply({
+        content: "Who are you????",
+        flags:   [ MessageFlags.Ephemeral ],
+      });
+      return;
+    }
+    void interaction.message.delete();
+    return;
+  }
+
+  if (interaction.isChatInputCommand()) {
+    handleChatInputCommand(amari, interaction);
+    return;
+  }
+
+  if (interaction.isAutocomplete()) {
+    return;
+  }
+
+  void interaction.reply({
+    content: "What?",
+    flags:   [ MessageFlags.Ephemeral ],
+  });
+};