Fix log file sorting by using timestamp-first filename format

Filenames are now timestamp_sha.jsonl instead of sha_timestamp.jsonl. This makes alphabetical sort equal to chronological sort, eliminating fragile string parsing and ensuring commit SHAs are ordered by their most recent log file timestamp.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

packages/spike/README.md

@@ -1,4 +1,4 @@
-# Spike
+# 🌵 Spike
 
 Discord-Gitea bridge bot. When someone opens a PR or leaves a comment on [git.nose.space](https://git.nose.space), Spike posts it to a Discord channel. When someone replies in the Discord thread, Spike posts it back to Gitea.
 

packages/spike/src/log.ts

@@ -47,7 +47,7 @@ mkdirSync(logsDir, { recursive: true })
 
 function createLogFile(): string {
   const timestamp = new Date().toISOString().replace(/[:.]/g, "-")
-  return `${logsDir}/${releaseSha}_${timestamp}.jsonl`
+  return `${logsDir}/${timestamp}_${releaseSha}.jsonl`
 }
 
 export function listLogFiles(): string[] {

packages/spike/src/server/logs.tsx

@@ -112,7 +112,7 @@ function Sidebar({ files, selectedFile }: { files: string[]; selectedFile?: stri
   // Group files by sha, sorted by most recent file in each group
   const grouped: Record<string, string[]> = {}
   for (const file of files) {
-    const sha = file.split("_")[0] || "unknown"
+    const sha = file.replace(".jsonl", "").split("_").pop() || "unknown"
     const list = grouped[sha] || (grouped[sha] = [])
     list.push(file)
   }
@@ -130,8 +130,8 @@ function Sidebar({ files, selectedFile }: { files: string[]; selectedFile?: stri
           <div style="padding: 4px 16px; color: #6b7280; font-size: 11px; font-family: monospace">{sha}</div>
           {shaFiles.map((file) => {
             const isSelected = file === selectedFile
-            // Parse ISO timestamp back from filename: sha_2026-03-10T02-56-59-938Z.jsonl
-            const isoStr = file.replace(/^[^_]+_/, "").replace(".jsonl", "").replace(/T(\d{2})-(\d{2})-(\d{2})-(\d+)Z/, "T$1:$2:$3.$4Z")
+            // Parse ISO timestamp back from filename: 2026-03-10T02-56-59-938Z_sha.jsonl
+            const isoStr = file.replace(/_[^_]+\.jsonl$/, "").replace(/T(\d{2})-(\d{2})-(\d{2})-(\d+)Z/, "T$1:$2:$3.$4Z")
             const bg = isSelected ? "#2a2a2a" : "transparent"
             return (
               <a