Remove vision tools (except take_screenshot) and macax tools

Vision tools removed:
- extract_text (OCR from image files)
- extract_text_with_boxes (OCR with bounding boxes)
- vision_find_text (find text in app windows)
- vision_click_text (find and click on text)
- vision_click_near_text (click near text labels)

macax tools removed:
- macax_list_apps
- macax_get_frontmost_app
- macax_activate_app
- macax_press_key
- macax_type_text

The LLM can now read images directly via read_image tool.
take_screenshot is retained for capturing application windows.

Files deleted:
- crates/g3-core/src/tools/vision.rs
- crates/g3-core/src/tools/macax.rs
- docs/macax-tools.md

Updated tool counts: 12 core + 15 webdriver = 27 total

crates/g3-config/src/lib.rs

@@ -10,7 +10,6 @@ pub struct Config {
     pub agent: AgentConfig,
     pub computer_control: ComputerControlConfig,
     pub webdriver: WebDriverConfig,
-    pub macax: MacAxConfig,
 }
 
 /// Provider configuration with named configs per provider type
@@ -139,17 +138,6 @@ pub struct WebDriverConfig {
     pub browser: WebDriverBrowser,
 }
 
-#[derive(Debug, Clone, Serialize, Deserialize)]
-pub struct MacAxConfig {
-    pub enabled: bool,
-}
-
-impl Default for MacAxConfig {
-    fn default() -> Self {
-        Self { enabled: false }
-    }
-}
-
 impl Default for WebDriverConfig {
     fn default() -> Self {
         Self {
@@ -212,7 +200,6 @@ impl Default for Config {
             },
             computer_control: ComputerControlConfig::default(),
             webdriver: WebDriverConfig::default(),
-            macax: MacAxConfig::default(),
         }
     }
 }

crates/g3-config/src/tests.rs

@@ -14,9 +14,6 @@ max_actions_per_second = 10
 [webdriver]
 enabled = false
 safari_port = 4444
-
-[macax]
-enabled = false
 "#
     }