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/main.py

@@ -783,6 +783,7 @@ def cmd_model(args):
         "opencode-zen": "OpenCode Zen",
         "opencode-go": "OpenCode Go",
         "ai-gateway": "AI Gateway",
+        "kilocode": "Kilo Code",
         "custom": "Custom endpoint",
     }
     active_label = provider_labels.get(active, active)
@@ -802,6 +803,7 @@ def cmd_model(args):
         ("kimi-coding", "Kimi / Moonshot (Moonshot AI direct API)"),
         ("minimax", "MiniMax (global direct API)"),
         ("minimax-cn", "MiniMax China (domestic direct API)"),
+        ("kilocode", "Kilo Code (Kilo Gateway API)"),
         ("opencode-zen", "OpenCode Zen (35+ curated models, pay-as-you-go)"),
         ("opencode-go", "OpenCode Go (open models, $10/month subscription)"),
         ("ai-gateway", "AI Gateway (Vercel — 200+ models, pay-per-use)"),
@@ -873,7 +875,7 @@ def cmd_model(args):
         _model_flow_anthropic(config, current_model)
     elif selected_provider == "kimi-coding":
         _model_flow_kimi(config, current_model)
-    elif selected_provider in ("zai", "minimax", "minimax-cn", "opencode-zen", "opencode-go", "ai-gateway"):
+    elif selected_provider in ("zai", "minimax", "minimax-cn", "kilocode", "opencode-zen", "opencode-go", "ai-gateway"):
         _model_flow_api_key_provider(config, selected_provider, current_model)
 
 
@@ -1433,6 +1435,13 @@ _PROVIDER_MODELS = {
         "MiniMax-M2.5-highspeed",
         "MiniMax-M2.1",
     ],
+    "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",
+    ],
 }
 
 
@@ -2609,7 +2618,7 @@ For more help on a command:
     )
     chat_parser.add_argument(
         "--provider",
-        choices=["auto", "openrouter", "nous", "openai-codex", "anthropic", "zai", "kimi-coding", "minimax", "minimax-cn"],
+        choices=["auto", "openrouter", "nous", "openai-codex", "anthropic", "zai", "kimi-coding", "minimax", "minimax-cn", "kilocode"],
         default=None,
         help="Inference provider (default: auto)"
     )