nil dereferencing bug fixed

README.md

@@ -96,7 +96,7 @@ refrax refactor --output="./out" --ai=deepseek test/test_data/java/person
 
 ### Checking Results
 
-`refrax` does not inherently verify whether the applied changes are correct or cause any issues. 
+`refrax` does not inherently verify whether the applied changes are correct or cause any issues.
 To address this, you can use the `--check` option to validate the changes. Multiple `--check` options can be provided, as shown below:
 
 ```sh

internal/critic/server.go

@@ -94,7 +94,13 @@ func (c *Critic) thinkLong(m *protocol.Message) (*protocol.Message, error) {
 		return nil, fmt.Errorf("failed to parse task from message: %w", err)
 	}
 	artifacts, err := c.agent.Review(tsk)
-	return artifacts.Marshal().Message, err
+	if err != nil {
+		return nil, fmt.Errorf("agent review failed: %w", err)
+	}
+	if artifacts == nil {
+		return nil, fmt.Errorf("agent review returned nil artifacts")
+	}
+	return artifacts.Marshal().Message, nil
 }
 
 func agentCard(port int) *protocol.AgentCard {

internal/domain/a2a.go

@@ -180,6 +180,9 @@ func (j *Job) Marshal() *protocol.MessageSendParams {
 }
 
 func (a *Artifacts) Marshal() *protocol.MessageSendParams {
+	if a == nil {
+		return protocol.NewMessageSendParams().WithMessage(protocol.NewMessage().WithMessageID(uuid.NewString()))
+	}
 	msg := protocol.NewMessage().WithMessageID(uuid.NewString())
 	if a.Descr != nil {
 		msg.AddPart(a.Descr.Marshal())

internal/domain/a2a_test.go

@@ -30,3 +30,10 @@ func TestMarshalAndUnmarshalJob(t *testing.T) {
 	require.NoError(t, err, "Unmarshaling job should not return an error")
 	assert.Equal(t, before, after, "Jobs should be equal after marshaling and unmarshaling")
 }
+
+func TestArtifactsMarshalDoesNotPanicOnNilReceiver(t *testing.T) {
+	var artifacts *Artifacts
+	result := artifacts.Marshal()
+	require.NotNil(t, result, "Marshal should not return nil even with nil receiver")
+	require.NotNil(t, result.Message, "Message should not be nil even with nil receiver")
+}

internal/prompts/critic/critic.md.tmpl

@@ -8,9 +8,9 @@ Identify issues such as:
 * unnecessary comments inside methods,
 * redundant code.
 
-Do **not** suggest any changes that alter functionality.  
-Do **not** suggest moving code between files (e.g., extract class or interface).  
-Do **not** suggest renaming methods or classes.  
+Do **not** suggest any changes that alter functionality.
+Do **not** suggest moving code between files (e.g., extract class or interface).
+Do **not** suggest renaming methods or classes.
 Do **not** suggest upgrading or replacing libraries.
 
 Consider the following imperfections reported by static analysis:
@@ -22,6 +22,5 @@ Consider the following imperfections reported by static analysis:
 (none)
 {{- end }}
 
-Respond with plain text, one suggestion per line.  
+Respond with plain text, one suggestion per line.
 If there are no significant issues, respond with: {{ .NotFound }}
-

internal/prompts/facilitator/choose.md.tmpl

@@ -16,4 +16,3 @@ Answer format (one per line):
 
 Example:
 src/test/java/com/example/service/Example.java: Fix the typo in the class comment
-

internal/prompts/facilitator/group.md.tmpl

@@ -20,4 +20,3 @@ Answer in the following format:
 
 Example:
 src/test/java/com/example/service/Example.java: Fix the typo in the class comment
-

internal/prompts/fixer/fix.md.tmpl

@@ -28,4 +28,3 @@ File: {{ .FilePath }}
 ## Final check (silent)
 - No leading/trailing blank lines outside the code.
 - No backtick fences, no “diff” syntax, no headings.
-

internal/prompts/reviewer/review.md.tmpl

@@ -31,4 +31,3 @@ Answer in the following format:
 
 Example:
 	src/test/java/com/example/service/Example.java: Fix the typo in the class comment
-

internal/reviewer/server.go

@@ -94,6 +94,9 @@ func (r *A2AReviewer) thinkLong(_ *protocol.Message) (*protocol.Message, error)
 	if err != nil {
 		return nil, fmt.Errorf("failed to  task: %w", err)
 	}
+	if artifacts == nil {
+		return nil, fmt.Errorf("review returned nil artifacts")
+	}
 	suggestions := artifacts.Suggestions
 	r.log.Info("number of processed suggestions: %d", len(suggestions))
 	logSuggestions(r.log, suggestions)