Use the Profullstack </> ASCII logo as the BBS banner

Replace the figlet "profullstack.com" wordmark with a scaled-down ASCII
rendition of the Profullstack </> mark (derived from the brand image),
shown on the join@ onboarding and the ssh <name>@ hub. Reuses the existing
banner plumbing; the mark is sourced from internal/brand and rendered in
Profullstack red.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

cmd/agentbbs/main.go

@@ -52,6 +52,7 @@ import (
 	gossh "golang.org/x/crypto/ssh"
 
 	"github.com/profullstack/agentbbs/internal/auth"
+	"github.com/profullstack/agentbbs/internal/brand"
 	"github.com/profullstack/agentbbs/internal/calls"
 	"github.com/profullstack/agentbbs/internal/chat"
 	"github.com/profullstack/agentbbs/internal/forgejo"
@@ -330,12 +331,9 @@ func (a *app) router() wish.Middleware {
 }
 
 // bbsBanner is the ASCII brand mark shown atop the hub menu and the join@ flow.
-const bbsBanner = "" +
-	"┌─┐┬─┐┌─┐┌─┐┬ ┬┬  ┬  ┌─┐┌┬┐┌─┐┌─┐┬┌─\n" +
-	"├─┘├┬┘│ │├┤ │ ││  │  └─┐ │ ├─┤│  ├┴┐\n" +
-	"┴  ┴└─└─┘└  └─┘┴─┘┴─┘└─┘ ┴ ┴ ┴└─┘┴ ┴ .com"
+var bbsBanner = brand.Logo()
 
-var bannerStyle = lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("#38bdf8"))
+var bannerStyle = lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("#e11d2a"))
 
 // hubMOTD is the welcome message shown in a box on the hub menu. The body is
 // operator-overridable via AGENTBBS_MOTD; it is tailored for guests vs members.

internal/brand/banner.go

@@ -0,0 +1,26 @@
+// Package brand holds AgentBBS's terminal branding — the ASCII logo shown
+// at the top of the join@ onboarding and the ssh <name>@ hub prompts.
+// Scaled down from the Profullstack </> mark.
+package brand
+
+import "strings"
+
+// logo is the ASCII rendition of the </> brand mark (UTF-8 block glyphs).
+const logo = `
+                            ▓████▓▒
+                           ▒█████▓
+          +▒▓             +▓████▓+   ▒+
+      :+▒▓▓▓▓            :▓██▓█▓+    ▒▓▓▓▒+
+   +▒▒▓▓▓▓▓▓▓            ▓▓▓▓▓▓+     ▒▓▓▓▓▓▒▒+
+:+▒▓▓▓▓▓▓▓▒+            ▒▓▓▓▓▓▒       +▒▓▓▓▓▓▓▒▒:
+▒▓▓▒▓▒▒▒:              +▓▓▓▓▓▓           :▒▒▒▒▒▒▒▒
+▒▒▒▒++                 ▒▓▓▓▓▓+              ++▒▒▒▒
+▒▒+                   +▓▓▓▓▓▒                  ++▒
+▒▒▒▒+                 ▒▓▓▓▓▒                  +▒▒▒
+▒▒▒▒▒▒▒+             ▒▓▓▓▓▒               +▒▒▒▒▒▒▒
++▒▒▒▒▒▒▒▒▒+         +▓▓▓▓▓:            +▒▒▒▒▒▒▒▒++
+`
+
+// Logo returns the plain (unstyled) multi-line ASCII brand banner, without
+// leading or trailing blank lines. The hub/join@ flows apply their own color.
+func Logo() string { return strings.Trim(logo, "\n") }

internal/hub/hub.go

@@ -27,7 +27,7 @@ var (
 	cursorStyle = lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("#4ade80"))
 	selStyle    = lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("#e2e8f0"))
 	lockStyle   = lipgloss.NewStyle().Foreground(lipgloss.Color("203"))
-	bannerStyle = lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("#38bdf8"))
+	bannerStyle = lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("#e11d2a"))
 	motdStyle   = lipgloss.NewStyle().
 			Border(lipgloss.RoundedBorder()).
 			BorderForeground(lipgloss.Color("#4ade80")).