feat: add semantic search tool for code symbol indexing and searching

- Implemented a new tool for semantic code search that indexes Rust code symbols (functions, structs, enums, traits, modules) and allows searching by name, concept, or meaning.
- Introduced a symbol index structure with methods for rebuilding the index and searching symbols.
- Added regex patterns for extracting various code symbols from Rust source files.
- Implemented scoring logic for search results based on exact matches, prefix matches, and context relevance.
- Created a web search tool that interacts with a SearXNG instance to fetch documentation and API information based on user queries.
- Added a diff preview overlay for rendering git diff output with color-coded additions and deletions in a TUI interface.

apps/infrastructure/src/tools/mod.rs

@@ -19,13 +19,16 @@ pub mod fs;
 pub mod git;
 pub mod lsp;
 pub mod memory;
+pub mod parallel_delegate;
 pub mod plan;
 pub mod search;
+pub mod semantic_search;
 pub mod sequential_think;
 pub mod shell;
 pub mod shell_filter;
 pub mod spawn;
 pub mod utility;
+pub mod web_search;
 pub mod workflow;
 
 pub use git::git_cred;
@@ -204,6 +207,10 @@ pub fn all_tools() -> Vec<Box<dyn Tool>> {
         Box::new(lsp::LspDefinition),
         Box::new(lsp::LspReferences),
         Box::new(lsp::LspDisconnect),
+        Box::new(web_search::WebSearch),
+        Box::new(semantic_search::SemanticSearch),
+        Box::new(semantic_search::RebuildIndex),
+        Box::new(parallel_delegate::ParallelDelegate),
     ]
 }