feat: implement Telegram bot for Claude status webhooks

Cloudflare Workers bot that forwards status.claude.com (Atlassian
Statuspage) incident and component updates to subscribed Telegram
users via CF Queues fan-out.

- Hono.js routing with grammY webhook handler
- Bot commands: /start, /stop, /status, /subscribe
- Supergroup topic support (message_thread_id)
- KV store with claude-status: prefix and composite keys
- Queue consumer with batch send, 403 auto-removal, 429 retry
- Timing-safe webhook secret validation
- HTML escaping for Telegram messages

src/status-fetcher.js

@@ -0,0 +1,53 @@
+const STATUS_API = "https://status.claude.com/api/v2/summary.json";
+
+/**
+ * Fetch all components from status.claude.com (excludes group-level entries)
+ */
+export async function fetchAllComponents() {
+  const res = await fetch(STATUS_API);
+  if (!res.ok) throw new Error(`Status API returned ${res.status}`);
+  const data = await res.json();
+  return data.components.filter((c) => !c.group);
+}
+
+/**
+ * Fuzzy match a component by name (case-insensitive includes)
+ */
+export async function fetchComponentByName(name) {
+  const components = await fetchAllComponents();
+  return components.find((c) =>
+    c.name.toLowerCase().includes(name.toLowerCase())
+  );
+}
+
+/**
+ * Human-readable status label
+ */
+export function humanizeStatus(status) {
+  const map = {
+    operational: "Operational",
+    degraded_performance: "Degraded Performance",
+    partial_outage: "Partial Outage",
+    major_outage: "Major Outage",
+    under_maintenance: "Under Maintenance",
+    investigating: "Investigating",
+    identified: "Identified",
+    monitoring: "Monitoring",
+    resolved: "Resolved",
+  };
+  return map[status] || status;
+}
+
+/**
+ * Escape HTML special chars for Telegram's HTML parse mode
+ */
+export function escapeHtml(s) {
+  return s?.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;") ?? "";
+}
+
+/**
+ * Format a single component as HTML line
+ */
+export function formatComponentLine(component) {
+  return `<b>${escapeHtml(component.name)}</b>: <code>${humanizeStatus(component.status)}</code>`;
+}