feat: Integrate Ollama reasoning for initial task planning

This commit introduces the new 'reasoning' module, which allows the bzzz-agent to connect to a local Ollama instance.

It also modifies the 'github' integration module to use this new capability. When a task is claimed, the agent now generates a step-by-step execution plan using an Ollama model and publishes this plan to the Antennae meta-discussion channel for peer review before proceeding.

This completes Phase 1 of the Ollama integration plan.

reasoning/reasoning.go

@@ -0,0 +1,79 @@
+package reasoning
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"time"
+)
+
+const (
+	ollamaAPIURL    = "http://localhost:11434/api/generate"
+	defaultTimeout  = 60 * time.Second
+)
+
+// OllamaRequest represents the request payload for the Ollama API.
+type OllamaRequest struct {
+	Model  string `json:"model"`
+	Prompt string `json:"prompt"`
+	Stream bool   `json:"stream"`
+}
+
+// OllamaResponse represents a single streamed response object from the Ollama API.
+type OllamaResponse struct {
+	Model     string    `json:"model"`
+	CreatedAt time.Time `json:"created_at"`
+	Response  string    `json:"response"`
+	Done      bool      `json:"done"`
+}
+
+// GenerateResponse queries the Ollama API with a given prompt and model,
+// and returns the complete generated response as a single string.
+func GenerateResponse(ctx context.Context, model, prompt string) (string, error) {
+	// Set up a timeout for the request
+	ctx, cancel := context.WithTimeout(ctx, defaultTimeout)
+	defer cancel()
+
+	// Create the request payload
+	requestPayload := OllamaRequest{
+		Model:  model,
+		Prompt: prompt,
+		Stream: false, // We will handle the full response at once for simplicity
+	}
+
+	payloadBytes, err := json.Marshal(requestPayload)
+	if err != nil {
+		return "", fmt.Errorf("failed to marshal ollama request: %w", err)
+	}
+
+	// Create the HTTP request
+	req, err := http.NewRequestWithContext(ctx, "POST", ollamaAPIURL, bytes.NewBuffer(payloadBytes))
+	if err != nil {
+		return "", fmt.Errorf("failed to create http request: %w", err)
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	// Execute the request
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return "", fmt.Errorf("failed to execute http request to ollama: %w", err)
+	}
+	defer resp.Body.Close()
+
+	// Check for non-200 status codes
+	if resp.StatusCode != http.StatusOK {
+		bodyBytes, _ := io.ReadAll(resp.Body)
+		return "", fmt.Errorf("ollama api returned non-200 status: %d - %s", resp.StatusCode, string(bodyBytes))
+	}
+
+	// Decode the JSON response
+	var ollamaResp OllamaResponse
+	if err := json.NewDecoder(resp.Body).Decode(&ollamaResp); err != nil {
+		return "", fmt.Errorf("failed to decode ollama response: %w", err)
+	}
+
+	return ollamaResp.Response, nil
+}