feat(tools): add web_search_tool for internet search

Add native web search capability that works regardless of LLM tool-calling
support. This is particularly useful for GLM models via Z.AI that don't
reliably support standard tool calling formats.

Features:
- DuckDuckGo provider (free, no API key required)
- Brave Search provider (optional, requires API key)
- Configurable max results and timeout
- Enabled by default

Configuration (config.toml):
  [web_search]
  enabled = true
  provider = "duckduckgo"
  max_results = 5

The tool allows agents to search the web for current information without
requiring proper tool calling support from the LLM.

Also includes CI workflow fix for first-interaction action inputs.

src/tools/mod.rs

@@ -25,6 +25,7 @@ pub mod schema;
 pub mod screenshot;
 pub mod shell;
 pub mod traits;
+pub mod web_search_tool;
 
 pub use browser::{BrowserTool, ComputerUseConfig};
 pub use browser_open::BrowserOpenTool;
@@ -56,6 +57,7 @@ pub use shell::ShellTool;
 pub use traits::Tool;
 #[allow(unused_imports)]
 pub use traits::{ToolResult, ToolSpec};
+pub use web_search_tool::WebSearchTool;
 
 use crate::config::{Config, DelegateAgentConfig};
 use crate::memory::Memory;
@@ -188,6 +190,16 @@ pub fn all_tools_with_runtime(
         )));
     }
 
+    // Web search tool (enabled by default for GLM and other models)
+    if root_config.web_search.enabled {
+        tools.push(Box::new(WebSearchTool::new(
+            root_config.web_search.provider.clone(),
+            root_config.web_search.brave_api_key.clone(),
+            root_config.web_search.max_results,
+            root_config.web_search.timeout_secs,
+        )));
+    }
+
     // Vision tools are always available
     tools.push(Box::new(ScreenshotTool::new(security.clone())));
     tools.push(Box::new(ImageInfoTool::new(security.clone())));