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>

pnpm-lock.yaml

@@ -8,6 +8,9 @@ importers:
 
   .:
     dependencies:
+      '@anthropic-ai/sdk':
+        specifier: 0.78.0
+        version: 0.78.0
       '@nhcarrigan/discord-analytics':
         specifier: 0.0.6
         version: 0.0.6(@nhcarrigan/logger@1.1.1)(discord.js@14.22.0)
@@ -54,6 +57,15 @@ importers:
 
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+    hasBin: true
+    peerDependencies:
+      zod: ^3.25.0 || ^4.0.0
+    peerDependenciesMeta:
+      zod:
+        optional: true
+
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     engines: {node: '>=6.9.0'}
 
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+    engines: {node: '>=6.9.0'}
+
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+    engines: {node: '>=16'}
+
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     engines: {node: '>=12'}
 
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+
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     engines: {node: '>=16'}
@@ -2392,6 +2415,10 @@ packages:
 
 snapshots:
 
+  '@anthropic-ai/sdk@0.78.0':
+    dependencies:
+      json-schema-to-ts: 3.1.1
+
   '@babel/code-frame@7.27.1':
     dependencies:
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@@ -2400,6 +2427,8 @@ snapshots:
 
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+  '@babel/runtime@7.28.6': {}
+
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@@ -4193,6 +4222,11 @@ snapshots:
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+  json-schema-to-ts@3.1.1:
+    dependencies:
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+      ts-algebra: 2.0.0
+
   json-schema-traverse@0.4.1: {}
 
   json-schema-traverse@1.0.0: {}
@@ -4813,6 +4847,8 @@ snapshots:
 
   toad-cache@3.7.0: {}
 
+  ts-algebra@2.0.0: {}
+
   ts-api-utils@1.4.3(typescript@5.9.3):
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