fix: enable Telegram spoiler rendering (#11543) (thanks @ezhikkk)

Render markdown ||spoiler|| syntax as <tg-spoiler> tags in Telegram HTML output.

The markdown IR already parses spoiler syntax, but the Telegram renderer was
missing the style marker. This adds the spoiler marker to renderTelegramHtml().

Fixes spoiler text appearing as raw ||text|| instead of hidden text.

CHANGELOG.md

@@ -11,6 +11,7 @@ Docs: https://docs.openclaw.ai
 ### Fixes
 
 - Agents: recover from context overflow caused by oversized tool results (pre-emptive capping + fallback truncation). (#11579) Thanks @tyler6204.
+- Telegram: render markdown spoilers with `<tg-spoiler>` HTML tags. (#11543) Thanks @ezhikkk.
 - Gateway/CLI: when `gateway.bind=lan`, use a LAN IP for probe URLs and Control UI links. (#11448) Thanks @AnonO6.
 - Memory: set Voyage embeddings `input_type` for improved retrieval. (#10818) Thanks @mcinteerj.
 - Memory/QMD: run boot refresh in background by default, add configurable QMD maintenance timeouts, and retry QMD after fallback failures. (#9690, #9705)

src/telegram/format.test.ts

@@ -68,4 +68,14 @@ describe("markdownToTelegramHtml", () => {
     const res = markdownToTelegramHtml("[**bold**](https://example.com)");
     expect(res).toBe('<a href="https://example.com"><b>bold</b></a>');
   });
+
+  it("renders spoiler tags", () => {
+    const res = markdownToTelegramHtml("the answer is ||42||");
+    expect(res).toBe("the answer is <tg-spoiler>42</tg-spoiler>");
+  });
+
+  it("renders spoiler with nested formatting", () => {
+    const res = markdownToTelegramHtml("||**secret** text||");
+    expect(res).toBe("<tg-spoiler><b>secret</b> text</tg-spoiler>");
+  });
 });

src/telegram/format.ts

@@ -45,6 +45,7 @@ function renderTelegramHtml(ir: MarkdownIR): string {
       strikethrough: { open: "<s>", close: "</s>" },
       code: { open: "<code>", close: "</code>" },
       code_block: { open: "<pre><code>", close: "</code></pre>" },
+      spoiler: { open: "<tg-spoiler>", close: "</tg-spoiler>" },
     },
     escapeText: escapeHtml,
     buildLink: buildTelegramLink,
@@ -57,6 +58,7 @@ export function markdownToTelegramHtml(
 ): string {
   const ir = markdownToIR(markdown ?? "", {
     linkify: true,
+    enableSpoilers: true,
     headingStyle: "none",
     blockquotePrefix: "",
     tableMode: options.tableMode,
@@ -82,6 +84,7 @@ export function markdownToTelegramChunks(
 ): TelegramFormattedChunk[] {
   const ir = markdownToIR(markdown ?? "", {
     linkify: true,
+    enableSpoilers: true,
     headingStyle: "none",
     blockquotePrefix: "",
     tableMode: options.tableMode,