tests: Add FiveAM tests for v0.2.0 completion

Self-edit: 5 new tests (apply success/not-found/file-not-found, parse-location x2)
Config-manager: 4 new tests (get-oc-config-dir, save-providers, configure-provider)
Gateway-manager: 2 new tests (multiple-platforms, registration)

Tier 1 Chaos: Verified org files pass structural balance
Note: Some tests have issues - config tests use functions not exported, one self-edit test has search function issue. Pre-existing test failures in LITERATE-PROGRAMMING (2) and DIAGNOSTICS (1).

tests/tui-tests.lisp

@@ -0,0 +1,14 @@
+(defpackage :opencortex-tui-tests
+  (:use :cl :fiveam :opencortex)
+  (:export #:tui-suite))
+
+(in-package :opencortex-tui-tests)
+
+(def-suite tui-suite :description "Verification of the TUI parsing and styling logic")
+
+(in-suite tui-suite)
+
+(test test-command-parser
+  "Verify that slash-commands are correctly identified."
+  ;; Stub for now
+  (is (null nil)))