feat(config): add obsidian and agents config sections

Author: devwhodevs

src/config.rs

@@ -14,6 +14,26 @@ pub struct ModelConfig {
     pub expand: Option<String>,
 }
 
+/// Obsidian integration configuration.
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct ObsidianConfig {
+    #[serde(default)]
+    pub enabled: bool,
+    pub vault_name: Option<String>,
+    pub cli_path: Option<PathBuf>,
+}
+
+/// Agent integration configuration.
+#[derive(Debug, Clone, Serialize, Deserialize, Default)]
+pub struct AgentsConfig {
+    #[serde(default)]
+    pub claude_code: bool,
+    #[serde(default)]
+    pub cursor: bool,
+    #[serde(default)]
+    pub windsurf: bool,
+}
+
 /// Application configuration, loaded from `~/.engraph/config.toml` with CLI overrides.
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[serde(default)]
@@ -30,6 +50,12 @@ pub struct Config {
     pub intelligence: Option<bool>,
     /// Model override URIs.
     pub models: ModelConfig,
+    /// Obsidian integration settings.
+    #[serde(default)]
+    pub obsidian: ObsidianConfig,
+    /// Agent integration settings.
+    #[serde(default)]
+    pub agents: AgentsConfig,
 }
 
 impl Default for Config {
@@ -41,6 +67,8 @@ impl Default for Config {
             batch_size: 64,
             intelligence: None,
             models: ModelConfig::default(),
+            obsidian: ObsidianConfig::default(),
+            agents: AgentsConfig::default(),
         }
     }
 }
@@ -216,6 +244,29 @@ rerank = "hf:ggml-org/Qwen3-Reranker-0.6B-Q8_0-GGUF/qwen3-reranker-0.6b-q8_0.ggu
         assert!(!cfg.intelligence_enabled());
     }
 
+    #[test]
+    fn test_config_backward_compat() {
+        // Old format: intelligence = true at top level
+        let toml = r#"intelligence = true"#;
+        let config: Config = toml::from_str(toml).unwrap();
+        assert_eq!(config.intelligence, Some(true));
+        // New fields default to None/false
+        assert!(!config.obsidian.enabled);
+    }
+
+    #[test]
+    fn test_config_with_obsidian() {
+        let toml = r#"
+intelligence = true
+[obsidian]
+enabled = true
+vault_name = "Personal"
+"#;
+        let config: Config = toml::from_str(toml).unwrap();
+        assert!(config.obsidian.enabled);
+        assert_eq!(config.obsidian.vault_name.as_deref(), Some("Personal"));
+    }
+
     #[test]
     fn test_config_roundtrip_with_intelligence() {
         let dir = tempfile::tempdir().unwrap();