fix(discord): honor thread allowlists in reactions

Co-authored-by: Codex <codex@openai.com>

src/channels/channel-config.test.ts

@@ -0,0 +1,24 @@
+import { describe, expect, it } from "vitest";
+
+import { buildChannelKeyCandidates, resolveChannelEntryMatch } from "./channel-config.js";
+
+describe("buildChannelKeyCandidates", () => {
+  it("dedupes and trims keys", () => {
+    expect(buildChannelKeyCandidates(" a ", "a", "", "b", "b")).toEqual(["a", "b"]);
+  });
+});
+
+describe("resolveChannelEntryMatch", () => {
+  it("returns matched entry and wildcard metadata", () => {
+    const entries = { a: { allow: true }, "*": { allow: false } };
+    const match = resolveChannelEntryMatch({
+      entries,
+      keys: ["missing", "a"],
+      wildcardKey: "*",
+    });
+    expect(match.entry).toBe(entries.a);
+    expect(match.key).toBe("a");
+    expect(match.wildcardEntry).toBe(entries["*"]);
+    expect(match.wildcardKey).toBe("*");
+  });
+});