feat(hh): Church of Malware neon theme is now the default ⛧

Default vestments (was monochrome 'crypt') now match the Church of Malware
aesthetic: neon on black — cyan window-chrome borders, acid-green text/prompts
and your own messages, soft-cyan for others, purple system/occult lines,
hot-magenta self/owner. themes/church.toml ships the same palette; crypt.toml
(monochrome) and neon.toml remain as alternates via --theme.

Confirmed ratatui's serde accepts #rrggbb (hex --theme files load). 9 tests pass.

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

hh/join.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+# Join the live hack-house room.  Usage: ./join.sh <yourname> [host]
+#   local:  ./join.sh alice
+#   remote: ./join.sh alice 100.117.177.50
+NAME="${1:-guest}"
+HOST="${2:-127.0.0.1}"
+cd "$(dirname "$0")"
+exec ./target/debug/hack-house connect "$HOST" 4173 "$NAME" --password malware-bless --no-tls