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CodeQL flagged 2 new high-severity "uncontrolled data used in path expression" alerts at the open() calls inside this PR's new requirements_has_real_deps()/requirements_are_satisfied() -- both are reachable from paths that were never run through the basename+trusted-base sanitiser this codebase already uses elsewhere: - PluginLoader.install_dependencies() only applied that sanitiser when its optional plugins_dir argument was actually passed; the "no plugins_dir" branch trusted plugin_dir_real directly. Made plugins_dir required (not Optional) so that branch can't exist, and added an explicit guard in load_plugin() so install_deps=True without a plugins_dir fails loudly instead of silently. Production's only real caller (PluginManager) always passes plugins_dir already; the harness/dev-server/render-plugin callers all use install_deps=False and are unaffected. - StoreManager._install_dependencies() never sanitised plugin_path at all, and its call sites ultimately derive that path from a plugin's own manifest.json "id" field (install_plugin_from_url) -- a malicious plugin could otherwise point requirements_file outside plugins_dir. Applied the same os.path.basename()-based containment pattern PluginLoader already uses (and that CodeQL recognises as a real sanitiser). Added test_install_dependencies_requires_plugins_dir and test_install_dependencies_rejects_path_outside_plugins_dir to lock in the actual security property, not just quiet the scanner. Verified: all 20 tests in test_plugin_loader.py pass, plus the PR's existing test plan (test_plugin_system.py, test_store_manager_caches.py: 53 passed) and the full CI plugin-safety suite (test_harness.py, test_visual_rendering.py, test_plugin_matrix.py: 52 passed, 2 pre-existing skips) all still pass.