refactor: move resource_dir to CompilationDatabase, rename test dirs (#369)

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

tests/unit/unit_tests.cc

@@ -3,7 +3,6 @@
 
 #include "eventide/deco/deco.h"
 #include "eventide/zest/zest.h"
-#include "support/filesystem.h"
 
 namespace {
 
@@ -15,10 +14,6 @@ struct TestOptions {
 }  // namespace
 
 int main(int argc, const char** argv) {
-    if(auto result = clice::fs::init_resource_dir(argv[0]); !result) {
-        return 1;
-    }
-
     auto args = deco::util::argvify(argc, argv);
     auto parsed = deco::cli::parse<TestOptions>(args);