feat(blotter): replace board stats with changelog-backed blotter

Add static blotter snapshot, route /blotter, compact board blotter (Hide/Show All).
Include yarn blotter tooling and AGENTS rules so every changelog version has a
release line. 4chan-style table UI, subplebbit→board and plebchan→5chan in messages.

src/components/blotter-message/blotter-message.module.css

@@ -0,0 +1,9 @@
+.versionLink {
+  color: var(--button-desktop-text-color);
+  text-decoration: var(--button-text-decoration);
+  text-transform: none;
+}
+
+.versionLink:hover {
+  color: var(--button-desktop-text-color-hover);
+}

src/components/blotter-message/blotter-message.tsx

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+import type { BlotterEntry } from '../../lib/utils/blotter-utils';
+import styles from './blotter-message.module.css';
+
+const RELEASES_BASE = 'https://github.com/bitsocialhq/5chan/releases/tag/v';
+
+function normalizeMessage(text: string): string {
+  return text.replace(/subplebbit/gi, 'board').replace(/plebchan/gi, '5chan');
+}
+
+const BlotterMessage = ({ entry }: { entry: BlotterEntry }) => {
+  if (entry.kind === 'release' && entry.version) {
+    const idx = entry.message.indexOf(': ');
+    const oneLiner = idx >= 0 ? entry.message.slice(idx + 2) : entry.message;
+    return (
+      <>
+        <a href={`${RELEASES_BASE}${entry.version}`} className={styles.versionLink} target='_blank' rel='noopener noreferrer'>
+          v{entry.version}
+        </a>
+        : {normalizeMessage(oneLiner)}
+      </>
+    );
+  }
+  return <>{normalizeMessage(entry.message)}</>;
+};
+
+export default BlotterMessage;

src/components/blotter-message/index.ts

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+export { default } from './blotter-message';