test: add live-LLM E2E moderation test suite

Add tests/llmE2e.test.ts — 7 end-to-end tests driving the REAL
moderation prompt pipeline (buildSystemPrompt → XML payload → llmChat
→ parseModerationResponse) against a live model via omniroute.

Covers: clean technical content (no false positives), harassment
(flagged), username-only offenses including 'Pecinta Pria' +
sexual/provocative usernames + SARA-in-username (always warn/low,
NEVER delete — the nickname-reset path), and spam bursts.

Gated behind AI_LLM_BASE_URL + AI_LLM_API_KEY: CI (no creds) skips
the file → 216 unit tests stay green, zero LLM cost. Run locally via
pnpm test:e2e:live (scripts/run-llm-e2e.sh injects creds from bws).

Verified: 223/223 tests pass with live LLM, stability across 4 runs,
typecheck + biome clean. docs: TESTING.md. ignore .hermes/ plans.

services/discord-gateway/package.json

@@ -18,7 +18,10 @@
     "typecheck": "tsc --noEmit",
     "lint": "biome check --diagnostic-level=error .",
     "format": "biome format --write .",
-    "test": "vitest run"
+    "test": "vitest run",
+    "test:unit": "vitest run --exclude \"tests/llmE2e.test.ts\"",
+    "test:e2e": "vitest run tests/llmE2e.test.ts",
+    "test:e2e:live": "bash scripts/run-llm-e2e.sh"
   },
   "dependencies": {
     "@discordjs/opus": "^0.10.0",