feat: add Kilo Code (kilocode) as first-class inference provider (#1666)

Add Kilo Gateway (kilo.ai) as an API-key provider with OpenAI-compatible
endpoint at https://api.kilo.ai/api/gateway. Supports 500+ models from
Anthropic, OpenAI, Google, xAI, Mistral, MiniMax via a single API key.

- Register kilocode in PROVIDER_REGISTRY with aliases (kilo, kilo-code,
  kilo-gateway) and KILOCODE_API_KEY / KILOCODE_BASE_URL env vars
- Add to model catalog, CLI provider menu, setup wizard, doctor checks
- Add google/gemini-3-flash-preview as default aux model
- 12 new tests covering registration, aliases, credential resolution,
  runtime config
- Documentation updates (env vars, config, fallback providers)
- Fix setup test index shift from provider insertion

Inspired by PR #1473 by @amanning3390.

Co-authored-by: amanning3390 <amanning3390@users.noreply.github.com>

hermes_cli/models.py

@@ -139,6 +139,13 @@ _PROVIDER_MODELS: dict[str, list[str]] = {
         "google/gemini-2.5-flash",
         "deepseek/deepseek-v3.2",
     ],
+    "kilocode": [
+        "anthropic/claude-opus-4.6",
+        "anthropic/claude-sonnet-4.6",
+        "openai/gpt-5.4",
+        "google/gemini-3-pro-preview",
+        "google/gemini-3-flash-preview",
+    ],
 }
 
 _PROVIDER_LABELS = {
@@ -154,6 +161,7 @@ _PROVIDER_LABELS = {
     "opencode-zen": "OpenCode Zen",
     "opencode-go": "OpenCode Go",
     "ai-gateway": "AI Gateway",
+    "kilocode": "Kilo Code",
     "custom": "Custom endpoint",
 }
 
@@ -176,6 +184,9 @@ _PROVIDER_ALIASES = {
     "aigateway": "ai-gateway",
     "vercel": "ai-gateway",
     "vercel-ai-gateway": "ai-gateway",
+    "kilo": "kilocode",
+    "kilo-code": "kilocode",
+    "kilo-gateway": "kilocode",
 }
 
 
@@ -209,7 +220,7 @@ def list_available_providers() -> list[dict[str, str]]:
     # Canonical providers in display order
     _PROVIDER_ORDER = [
         "openrouter", "nous", "openai-codex",
-        "zai", "kimi-coding", "minimax", "minimax-cn", "anthropic",
+        "zai", "kimi-coding", "minimax", "minimax-cn", "kilocode", "anthropic",
         "opencode-zen", "opencode-go",
         "ai-gateway", "deepseek", "custom",
     ]