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

cmake/gtest.cmake

@@ -18,3 +18,10 @@ set_property(TARGET
 	gmock
 	gmock_main
 	PROPERTY FOLDER third_party/GoogleTest)
+
+# GoogleTest adds exception flags of its own; keep it aligned with project targets.
+foreach(_test_dependency IN ITEMS gtest gtest_main gmock gmock_main)
+    get_target_property(_test_compile_flags ${_test_dependency} COMPILE_FLAGS)
+    string(REGEX REPLACE "[-/]EHsc|[-/]D_HAS_EXCEPTIONS=1|-fexceptions" "" _test_compile_flags "${_test_compile_flags}")
+    set_property(TARGET ${_test_dependency} PROPERTY COMPILE_FLAGS "${_test_compile_flags}")
+endforeach()