docs: align project documentation with ollama provider

TASKS.md

@@ -677,6 +677,43 @@ Status: ✅ Complete
 
 ---
 
+## Phase 9 — Ollama Provider Support
+
+### Task 9.1 — Ollama provider implementation ✅
+
+Create `src/providers/ollama.js` and integrate into the provider factory.
+
+**Implementation:**
+- Uses Ollama `/api/chat` endpoint (OpenAI-compatible format) via native `fetch()` — zero new dependencies
+- Implements `{ send(reviewRequest, config) => Promise<{ content: string }> }` provider interface
+- Error categories: `OllamaTimeoutError`, `OllamaModelNotFoundError`, `OllamaValidationError`, `OllamaApiNotAvailableError`, `OllamaRequestError`
+
+**Defaults:**
+| Setting | Default Value |
+|---------|---------------|
+| Base URL | `http://localhost:11434` |
+| Model | `qwen3:latest` |
+| Temperature | `0.2` |
+| Timeout | `60` seconds |
+
+**Environment variables:**
+```env
+OLLAMA_BASE_URL=http://localhost:11434   # or custom Ollama endpoint
+OLLAMA_MODEL=qwen3:latest                # default model for chat
+OLLAMA_TEMPERATURE=0.2                   # sampling temperature
+OLLAMA_TIMEOUT=60                         # request timeout in seconds
+```
+
+**Factory integration:**
+- `"ollama"` added to SUPPORTED_PROVIDERS whitelist: `Set(["openai", "manual", "ollama"])`
+- `CHATGPT_MCP_PROVIDER=ollama` switches all tool handlers to local Ollama mode
+- Defaults to `"openai"` when not set — OpenAI behaviour unchanged
+- Same provider interface as openai and manual providers
+
+**Status:** ✅ Complete
+
+---
+
 ### Task 8.0 — Implement ReviewRequest and Manual Export Provider
 
 Add a zero-API-cost Manual Export provider that generates copy/paste-ready prompts for ChatGPT Web (https://chatgpt.com).
@@ -720,5 +757,6 @@ Status: ✅ Complete
 | 6 | Provider Abstraction | ✅ Complete (factory + adapter) |
 | 7 | Integration and Tests | ✅ Complete (579 tests across 20 files) |
 | 8 | Manual Export Provider | ✅ Complete (Task 8.0, 644 tests across 21 files) |
+| 9 | Ollama Provider Support | ✅ Complete (Task 9.1, 644 tests across 21 files) |
 
-**Total:** All planned MVP tasks complete. 644 passing tests, zero regressions, all docs updated.
+**Total:** All planned MVP tasks complete. 644 passing tests, zero regressions, all docs updated. **3 supported providers: openai, manual, ollama.**