Document git notes integration for conversation logging

Add comprehensive documentation for the git notes functionality:
- Example usage and real-world scenarios
- Commands for viewing conversation context attached to commits
- Configuration options via .claude/notes.json
- Privacy controls and sensitive data filtering
- Team collaboration workflows for sharing git notes
- Complete JSON example showing structured conversation data

Users can now easily understand how to view and configure the
automatic conversation context attachment to their git commits.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

internal/config/notes.go

@@ -0,0 +1,83 @@
+package config
+
+import (
+	"encoding/json"
+	"os"
+	"path/filepath"
+)
+
+// NotesConfig controls git notes behavior for conversation logging
+type NotesConfig struct {
+	Enabled           bool     `json:"enabled"`             // Whether to attach notes to commits
+	MaxExcerptLength  int      `json:"max_excerpt_length"`  // Maximum length of conversation excerpt
+	MaxPrompts        int      `json:"max_prompts"`         // Maximum number of user prompts to include
+	IncludeToolOutput bool     `json:"include_tool_output"` // Whether to include tool output in notes
+	NotesRef          string   `json:"notes_ref"`           // Git notes reference name
+	ExcludePatterns   []string `json:"exclude_patterns"`    // Patterns to exclude from notes
+}
+
+// DefaultNotesConfig returns the default configuration
+func DefaultNotesConfig() *NotesConfig {
+	return &NotesConfig{
+		Enabled:           true,
+		MaxExcerptLength:  5000,
+		MaxPrompts:        2,
+		IncludeToolOutput: false, // Privacy: don't include potentially sensitive output
+		NotesRef:          "claude-conversations",
+		ExcludePatterns: []string{
+			"password",
+			"token",
+			"key",
+			"secret",
+			"api_key",
+			"auth",
+		},
+	}
+}
+
+// LoadNotesConfig loads notes configuration from file or returns default
+func LoadNotesConfig(projectDir string) *NotesConfig {
+	configPath := filepath.Join(projectDir, ".claude", "notes.json")
+
+	// Try to read config file
+	data, err := os.ReadFile(configPath)
+	if err != nil {
+		// File doesn't exist, use defaults
+		return DefaultNotesConfig()
+	}
+
+	var config NotesConfig
+	if err := json.Unmarshal(data, &config); err != nil {
+		// Invalid config file, use defaults
+		return DefaultNotesConfig()
+	}
+
+	// Ensure required fields have defaults if missing
+	if config.NotesRef == "" {
+		config.NotesRef = "claude-conversations"
+	}
+	if config.MaxExcerptLength <= 0 {
+		config.MaxExcerptLength = 5000
+	}
+	if config.MaxPrompts <= 0 {
+		config.MaxPrompts = 2
+	}
+
+	return &config
+}
+
+// SaveNotesConfig saves notes configuration to file
+func SaveNotesConfig(projectDir string, config *NotesConfig) error {
+	claudeDir := filepath.Join(projectDir, ".claude")
+	if err := os.MkdirAll(claudeDir, 0755); err != nil {
+		return err
+	}
+
+	configPath := filepath.Join(claudeDir, "notes.json")
+	data, err := json.MarshalIndent(config, "", "  ")
+	if err != nil {
+		return err
+	}
+
+	return os.WriteFile(configPath, data, 0644)
+}