chore: import upstream snapshot with attribution

@omniroute/opencode-plugin/tests/auto-combo-context.test.ts

@@ -0,0 +1,74 @@
+/**
+ * TDD regression — auto combos must never advertise `limit.context: 0`.
+ *
+ * opencode's overflow guard (packages/opencode/src/session/overflow.ts)
+ * short-circuits when `model.limit.context === 0`:
+ *
+ *   if (input.model.limit.context === 0) return false  // never overflow
+ *
+ * so a zero context silently DISABLES opencode's smart auto-compaction for
+ * auto combos. The session then grows unbounded until OmniRoute's
+ * server-side purifyHistory() destructively drops old messages — the
+ * "coding agent keeps forgetting things" bug.
+ *
+ * Fix under test: mapAutoComboToStaticEntry consumes the context_length /
+ * max_output_tokens now served by GET /api/combos/auto, and falls back to a
+ * safe positive default (128000 / 8192) for older servers that do not send
+ * the fields yet.
+ */
+import test from "node:test";
+import assert from "node:assert/strict";
+
+import { mapAutoComboToStaticEntry } from "../src/index.ts";
+import type { OmniRouteRawAutoCombo } from "../src/index.ts";
+
+test("uses server-provided context_length and max_output_tokens", () => {
+  const raw = {
+    id: "auto/coding",
+    name: "Auto Coding",
+    variant: "coding",
+    candidateCount: 5,
+    context_length: 1048576,
+    max_output_tokens: 65536,
+  } as OmniRouteRawAutoCombo;
+
+  const entry = mapAutoComboToStaticEntry(raw);
+  assert.equal(entry.limit?.context, 1048576);
+  assert.equal(entry.limit?.output, 65536);
+});
+
+test("falls back to a safe positive default when the server omits limits (old servers)", () => {
+  const raw = {
+    id: "auto",
+    name: "Auto",
+    candidateCount: 3,
+  } as OmniRouteRawAutoCombo;
+
+  const entry = mapAutoComboToStaticEntry(raw);
+  assert.ok(
+    typeof entry.limit?.context === "number" && entry.limit.context > 0,
+    `context must be a positive number (never 0 — zero disables opencode auto-compaction), got ${entry.limit?.context}`
+  );
+  assert.ok(
+    typeof entry.limit?.output === "number" && entry.limit.output > 0,
+    `output must be a positive number, got ${entry.limit?.output}`
+  );
+});
+
+test("ignores non-positive server values and keeps the safe fallback", () => {
+  const raw = {
+    id: "auto/fast",
+    name: "Auto Fast",
+    variant: "fast",
+    candidateCount: 2,
+    context_length: 0,
+    max_output_tokens: -1,
+  } as OmniRouteRawAutoCombo;
+
+  const entry = mapAutoComboToStaticEntry(raw);
+  assert.ok(
+    typeof entry.limit?.context === "number" && entry.limit.context > 0,
+    "zero/negative server values must not propagate"
+  );
+  assert.ok(typeof entry.limit?.output === "number" && entry.limit.output > 0);
+});