Add activity-core LLM endpoint support

contracts/functional/server.md

@@ -62,7 +62,51 @@ Execute a prompt through the configured adapter.
 |------|-----------|
 | 400 | Missing `prompt` field or invalid JSON body |
 | 404 | Unknown path |
-| 500 | Adapter raised an exception |
+| 429 | Provider rate limit |
+| 500 | Configuration or adapter failure |
+| 502 | Provider API / transport failure |
+| 504 | Provider timeout |
+
+Server error bodies are structured and must not expose provider credentials:
+
+```json
+{
+  "error": "provider_api_error",
+  "message": "HTTP 500 from https://provider.example/v1?key=<redacted>",
+  "type": "LLMAPIError",
+  "provider_status": 500
+}
+```
+
+Known error codes include `unknown_profile`, `configuration_error`,
+`provider_api_error`, `provider_rate_limited`, `provider_timeout`,
+`budget_exceeded`, `llm_error`, and `internal_error`.
+
+## Runtime profiles
+
+Server CLI mode wraps the configured adapter with runtime profile dispatch
+unless `--disable-profiles` is passed. The activity-core profile
+`custodian-triage-balanced` is built in and resolves to the configured provider
+and model before calling the underlying adapter.
+
+Default profile values:
+
+| Field | Default |
+|-------|---------|
+| provider | `openrouter` |
+| model | `anthropic/claude-sonnet-4` |
+| temperature | `0.2` |
+| max_tokens | `1800` |
+| max_depth | `2` |
+| timeout_seconds | `300` |
+| model_params.reasoning_effort | `medium` |
+
+Profile provider/model and default call values can be overridden with
+environment variables such as `LLM_CONNECT_CUSTODIAN_TRIAGE_PROVIDER`,
+`LLM_CONNECT_CUSTODIAN_TRIAGE_MODEL`, and
+`LLM_CONNECT_CUSTODIAN_TRIAGE_MAX_TOKENS`. Operators can also set
+`LLM_CONNECT_PROFILES_JSON` or `LLM_CONNECT_PROFILE_FILE` to provide JSON
+profile definitions keyed by profile name.
 
 ## Implementation notes
 
@@ -75,10 +119,12 @@ Execute a prompt through the configured adapter.
 ## CLI
 
 ```
-python -m llm_connect.server [--host HOST] [--port PORT] [--provider PROVIDER] [--model MODEL]
+python -m llm_connect.server [--host HOST] [--port PORT] [--provider PROVIDER] [--model MODEL] [--disable-profiles] [--strict-profiles]
 ```
 
-Default provider: `mock`.  All registered providers from `create_adapter` are valid.
+CLI defaults can also be supplied with `LLM_CONNECT_HOST`, `LLM_CONNECT_PORT`,
+`LLM_CONNECT_PROVIDER`, and `LLM_CONNECT_MODEL`. Default provider: `mock`. All
+registered providers from `create_adapter` are valid.
 
 ## Known consumers