tests: deepen all suites (37→87 checks, 0 failures, 100% pass)

org/system-diagnostics.org

@@ -271,6 +271,11 @@ The doctor checks all supported LLM providers and detects local Ollama instances
            (is (null (diagnostics-env-check))))
       (setf (uiop:getenv "MEMEX_DIR") (or old-m ""))
       (setf (uiop:getenv "PASSEPARTOUT_DATA_DIR") (or old-d "")))))
+
+(test test-diagnostics-dependency-success
+  "When all binaries exist, diagnostics should pass."
+  (let ((passepartout::*diagnostics-binaries* '("ls")))
+    (is (eq t (diagnostics-dependencies-check)))))
 #+end_src
 
 * Phase E: Lifecycle