Expand AGENTS.md: topology, one-line-fit preference, real-time triggers

Homelab topology: pulled the infrastructure context from the original
handover doc (FreeBSD version, WireGuard/Caddy/ZFS/jail network
layout) that isn't otherwise captured now that check.sh is gone.

Design preference: documents "rows should fit on one line" as a
standing preference (not a one-off ask), with checks/pf.sh's
abbreviate_rule() development as the worked example of how to compress
long/variable-length output - strip ruleset-specific boilerplate,
verify symbol choices against the font's actual glyph coverage, prefer
legible bracket-letter tags over clever-but-obscure unicode when a
distinction has real meaning, and always confirm via a rendered
preview rather than eyeballing character counts.

When cron + static HTML stops being enough: concrete signals (need for
alerting, history/trends, sub-minute or push-based updates, render
time approaching the cron interval) that mean this architecture is
being outgrown, so a future ask crossing one of these gets flagged
explicitly instead of worked around within the current design.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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