Credibility pass: one conflict check, one hostile list, one set of chrome

Duplicated logic and styling that had drifted apart is unified: the
gesture-sharing check, the hostile spell list, the enchanted test, the
plan limits, and the shared button, link, field and disabled styles.
Dead plumbing is gone: the always-true implemented flag, the unread
cast length, an unreachable guard, an impossible time-stop condition,
the unused sequence formatter and utility class, the template
placeholder. The counter-spell tests now put a counter-spell in front
of a spell, the test helpers live in one file, and the resolver's
sections are numbered in order. The deploy script's cache headers now
do what its comment says, and the README describes the screen rather
than listing features in the order they arrived.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

deploy/README.md

@@ -12,10 +12,10 @@ The smallest droplet is enough: `s-1vcpu-512mb-10gb` ($4 a month). The build
 is under half a megabyte and Caddy idles in about 30 MB of memory. Move up to
 `s-1vcpu-1gb` only if the site ever gains a server side.
 
-The zero-cost alternative is a second site block in the wizwar droplet's
-Caddyfile pointing at a second directory; the deploy script works unchanged
-against that host. A separate droplet keeps the two games' uptime and
-upgrades independent.
+The zero-cost alternative is a second site block in an existing Caddy
+server's configuration pointing at a second directory; the deploy script
+works unchanged against that host. A droplet of its own keeps this site's
+uptime and upgrades independent of anything else.
 
 ## Current production