docs: align project documentation with ollama provider

ARCHITECTURE.md

@@ -448,8 +448,9 @@ Supported provider values:
 | -------- | -------------------------------------------------------------- | ----------------- |
 | `openai` | Default — calls ChatGPT via OpenAI API                       | Yes               |
 | `manual` | Copy-paste — wraps prompts in a ready-to-copy format         | No                |
+| `ollama` | Local AI — uses Ollama `/api/chat` endpoint with Qwen3       | No                |
 
-The factory whitelists `"openai"` and `"manual"`. Any unrecognized value throws at provider creation time (not config load time). Null/NaN/falsy values default to `"openai"` for safe fallback.
+The factory whitelists `"openai"`, `"manual"`, and `"ollama"`. Any unrecognized value throws at provider creation time (not config load time). Null/NaN/falsy values default to `"openai"` for safe fallback.
 
 ### OpenAI-specific Environment Variables
 
@@ -460,7 +461,16 @@ OPENAI_TEMPERATURE=0.2
 OPENAI_MAX_OUTPUT_TOKENS=2000
 ```
 
-The provider pattern makes it straightforward to add other providers (Ollama, Anthropic, custom) — implement the `send(request, config)` interface and register it in the factory's whitelist.
+### Ollama-specific Environment Variables
+
+```env
+OLLAMA_BASE_URL=http://localhost:11434   # Ollama API endpoint
+OLLAMA_MODEL=qwen3:latest                # default model for chat requests
+OLLAMA_TEMPERATURE=0.2                   # sampling temperature
+OLLAMA_TIMEOUT=60                         # request timeout in seconds
+```
+
+The provider pattern makes it straightforward to add other providers (Anthropic, custom) — implement the `send(request, config)` interface and register it in the factory's whitelist. Ollama is already implemented.
 
 ---
 
@@ -801,7 +811,7 @@ Near term:
 
 Medium term:
 
-- Add optional Ollama provider.
+- Add Anthropic provider.
 - Add model-per-tool config.
 - Add cost tracking.
 - Add timeout/retry tuning.
@@ -814,7 +824,6 @@ Later:
 - Add Gitea pull request workflow.
 - Add safe project summary generation.
 - Add optional OpenHands integration.
-- Implement Ollama provider (factory already supports it).
 - Implement Anthropic provider.
 - Add streaming responses support.
 - Add cost tracking per tool call.