docs: align project documentation with ollama provider

AGENT_HANDOFF.md

@@ -133,6 +133,40 @@ Decoupled tool handlers from OpenAI implementation via a provider abstraction la
 - No `chat.openai.com` references in codebase — only `chatgpt.com`
 - MCP initialize handshake succeeds with chatgpt-mcp v0.1.0
 
+## Completed (Phase 9) — Ollama Provider ✅
+
+### src/providers/ollama.js
+- `ollamaProvider.send(reviewRequest, config)` — local AI provider using Ollama `/api/chat` endpoint
+- Uses native `fetch()` for HTTP calls — zero new dependencies
+- Implements same provider interface as openai and manual: `{ send(request, config) => Promise<{ content: string }> }`
+
+### Provider details
+- **Request format**: OpenAI-compatible chat API (`model`, `messages`, `stream`, `options`)
+- **Response parsing**: Extracts `data.message.content` from Ollama response
+- **Error categories**: `OllamaTimeoutError`, `OllamaModelNotFoundError` (404), `OllamaValidationError` (422), `OllamaApiNotAvailableError` (501), `OllamaRequestError` (fallback)
+- **Base URL normalization**: Strips trailing slashes for safe path concatenation
+
+### Environment variables
+| Variable | Default | Description |
+|----------|---------|-------------|
+| `OLLAMA_BASE_URL` | `http://localhost:11434` | Ollama API endpoint |
+| `OLLAMA_MODEL` | `qwen3:latest` | Model name for chat requests |
+| `OLLAMA_TEMPERATURE` | `0.2` | Sampling temperature |
+| `OLLAMA_TIMEOUT` | `60` | Request timeout in seconds |
+
+### Factory integration
+- `"ollama"` added to SUPPORTED_PROVIDERS whitelist in `src/providers/factory.js`: `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
+
+### Current provider status
+| Provider | Env Value | Type | Requires API key? |
+|----------|-----------|------|-------------------|
+| `openai` | `CHATGPT_MCP_PROVIDER=openai` | Cloud (OpenAI Responses API) | Yes (`OPENAI_API_KEY`) |
+| `manual` | `CHATGPT_MCP_PROVIDER=manual` | Local (copy-paste) | No |
+| `ollama` | `CHATGPT_MCP_PROVIDER=ollama` | Local (Ollama /api/chat) | No |
+
 ## Completed (Phase 5)
 
 **All five MCP tools registered:** ask_chatgpt, review_plan, review_code, debug_issue, architecture_review.
@@ -208,7 +242,7 @@ Project-local Claude Code discovery configured:
 
 ## Next Pending
 
-No pending tasks. MVP complete. Future work: additional providers (Ollama, Anthropic), streaming responses, cost tracking, Dockerfile, CI pipeline, safe project summary generation.
+No pending tasks. MVP complete. Future work: Anthropic provider, streaming responses, cost tracking, Dockerfile, CI pipeline, safe project summary generation.
 
 ## General Rules