chore: clear dead test and allowlist leftovers of dropped runtimes

scripts/lint-retired-runtime-name.cjs

@@ -392,8 +392,8 @@ const RUNTIME_WORD_RE = new RegExp(
 // Positive evidence that the line is on the MODEL axis. Required, not merely
 // the absence of a runtime word: a reviewer demonstrated that "absence of a
 // veto word" is not evidence, with `The installer now offers Gemini 3.`,
-// `MSD installs cleanly on Gemini 3, Cline, and Codex.` and
-// `Supported agents include Gemini 3, Cline, and Cursor.` all exiting 0 — the
+// `MSD installs cleanly on Gemini 3, Cursor, and Codex.` and
+// `Supported agents include Gemini 3, OpenCode, and Cursor.` all exiting 0 — the
 // exact laundering class this guard exists to catch. Every real model-axis
 // line in this repo names a model explicitly, so requiring it costs nothing
 // and inverts the failure direction from "silently allow" to "flag".