feat(edge): unrouted hosts 404+noindex everywhere; access log moves into the container (2026.11.2)

Default splash (Josh 2026-11-08): unrouted hosts are 404 on EVERY path incl.
"/" (same static page), with cache-control: no-store, x-robots-tag: noindex,
nofollow, noarchive and nosniff; /robots.txt answers 200 "Disallow: /". So the
server IP/hostname is never indexed as a site. Routed sites, ACME, blocked
IPs, suspended hosts, rate limits, wp-* gates and WAF are unchanged.

Access log: the old target 172.18.0.1:514 (host rsyslog) had no listener on
the fleet. HAProxy now logs to a UNIX datagram socket in its chroot
(`log /log.sock`, i.e. /var/lib/haproxy/log.sock); scripts/haproxy-log-receiver.py
(started before init.py, supervised by a restart loop in start-up.sh) writes
/var/log/haproxy/access.log rotated at 40 MB + 4 gzip generations (<= 200 MB).
No network listener; sends are non-blocking, so a dead/stalled receiver or a
full disk only drops lines (DroppedLogs). Nothing is printed to docker logs
(WHP's AI monitor reads them). Same log-format (cip/host/status/Coraza fields).
HAPROXY_SYSLOG_TARGET still overrides. show-tarpit-ips.sh / monitor-attacks.sh
point at the new file.

Tests: test-default-splash.py (19, incl. log target), new
test-access-log-receiver.py (10), both in the image build; validate-rendered-
config.py scenarios all accepted by haproxy -c. Lab (pre-populated volume,
recreate): 404+headers on hostname/IP/unknown, robots 200, routed site 200,
attack on site 403, ACME 200, suspended 503; 2000/2000 burst lines logged;
receiver kill -9 -> requests 200, receiver back <3s; SIGSTOP + 2500 requests
-> all 200, 1475 DroppedLogs; rotation at 64 KB cap kept 1+2 gz; logs survive
recreate on the haproxy-logs volume.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0185ukXjXyosSkunDsdWz3mb

scripts/validate-rendered-config.py

@@ -130,6 +130,7 @@ STUB_FILES = {
     '/haproxy/errors/403-waf.html': '<html><body>blocked %[unique-id]</body></html>\n',
     # `file` on the default-splash return rules; loaded at parse time too.
     '/haproxy/errors/default-splash.html': '<html><body>splash</body></html>\n',
+    '/haproxy/errors/robots-unrouted.txt': 'User-agent: *\nDisallow: /\n',
 }
 
 # (suspension_enabled, coraza_spoe_backend) combinations to render + validate.