Implement bounded repository navigation with repo-lens

- Add map, find, and around commands with repository root discovery
- Stream literal ripgrep searches with match counts and result limits
- Add direct subprocess execution and explicit error returns
- Disable C++ exceptions and add navigation tests
- Support CMake installation and document builds and deployment
- Add a reusable agent skill and document skill discovery

CMakeLists.txt

@@ -5,6 +5,15 @@ project(repo-lens VERSION 1.0.0 LANGUAGES CXX)
 set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED true)
 set(CMAKE_CXX_EXTENSIONS OFF)
+
+# Recoverable failures use explicit status returns throughout the project.
+if(MSVC)
+    string(REGEX REPLACE "/EH[a-zA-Z+-]+" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+    add_compile_options(/EHs-c-)
+    add_compile_definitions(_HAS_EXCEPTIONS=0)
+else()
+    add_compile_options(-fno-exceptions)
+endif()
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON CACHE BOOL "Generate compile_commands.json with supported generators")
 
 set_property(GLOBAL PROPERTY USE_FOLDERS ON)