feat(scripts): add uptime-check retry + Obsidian variant, add LLM benchmark docs

check_uptime.js gets a fetchWithRetry wrapper (3 attempts, 2s backoff)
for transient failures against the status page/heartbeat API.
check_uptime_to_obsidian.js is a variant that logs results into the
Obsidian vault instead of stdout. Also adds two benchmark writeups
(gpt-oss-20b on Ollama, 73-node Ollama fleet).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

scripts/check_uptime.js

@@ -1,10 +1,27 @@
 const fs = require('fs');
 const path = require('path');
 
+async function fetchWithRetry(url, options = {}, retries = 3, backoff = 2000) {
+  for (let i = 0; i < retries; i++) {
+    try {
+      const response = await fetch(url, options);
+      if (response.ok) return response;
+      if (response.status >= 500) {
+        throw new Error(`HTTP ${response.status}: ${response.statusText}`);
+      }
+      return response;
+    } catch (err) {
+      if (i === retries - 1) throw err;
+      console.warn(`Fetch to ${url} failed (attempt ${i + 1}/${retries}): ${err.message}. Retrying in ${backoff}ms...`);
+      await new Promise(resolve => setTimeout(resolve, backoff));
+    }
+  }
+}
+
 async function checkStatus() {
   try {
     // 1. Fetch status page HTML
-    const htmlResponse = await fetch('https://uptime.ginnoir.com/status/default');
+    const htmlResponse = await fetchWithRetry('https://uptime.ginnoir.com/status/default');
     if (!htmlResponse.ok) {
       throw new Error(`Failed to fetch status page: ${htmlResponse.statusText}`);
     }
@@ -34,7 +51,7 @@ async function checkStatus() {
     }
 
     // 2. Fetch heartbeat JSON
-    const heartbeatResponse = await fetch('https://uptime.ginnoir.com/api/status-page/heartbeat/default');
+    const heartbeatResponse = await fetchWithRetry('https://uptime.ginnoir.com/api/status-page/heartbeat/default');
     if (!heartbeatResponse.ok) {
       throw new Error(`Failed to fetch heartbeat: ${heartbeatResponse.statusText}`);
     }