feat(rules): user permanent rules — writing style, web building, web security (BDR-085)

Three rules/ files from the user's permanent-rules text:
- writing-style.md (always-on): em-dash ban, no it's-not-X-it's-Y, no
  emoji, no decorative bold, no reflex triads, no hedging chains, slop
  vocabulary ban, sentence-length variety, deliverable self-check.
  Scope carve-outs keep caveman registries, code comments, skill
  templates intact.
- web-building.md (path-scoped): design anti-default list + public-site
  done checklist (report missing items, never invent them).
- web-security.md (path-scoped): browser-exposed keys, service-key/client
  split, RLS, server-side auth, IDOR, cookie flags, field minimization,
  rate limiting — extends §Security, no dup of the core.
Project CLAUDE.md rules/ doctrine: 320-budget exception for standalone
always-on user rule sets.

rules/web-building.md

@@ -0,0 +1,30 @@
+---
+paths: ["**/*.html", "**/*.astro", "**/*.css", "**/*.scss", "**/*.tsx", "**/*.jsx", "**/*.vue", "**/*.svelte"]
+---
+
+# Web building — no default reflexes + done checklist
+
+## Avoid unless the user asks for them
+- Purple gradient, purple/black, neon, washed-out pastels, rainbow.
+- Drop shadow on everything; the same border-radius on every element.
+- Bento grid, dot grid, glowing background orbs, decorative color strip.
+- Sparkle icons, animated arrows, emojis as icons, decorative fake
+  terminal window.
+- Hover animation on every element; scroll-reveal animations everywhere.
+- Three aligned feature cards, three pricing tiers, checkmark bullets.
+- Vague hero title ("unleash your potential"): state what the product does.
+- Fake testimonials, fake visitor or client counters, invented numbers.
+  Never, in any context.
+- Inter, Geist or Space Grotesk as the default font: propose an
+  alternative and justify it. Existing brand identities keep their fonts.
+
+## Before declaring a public site done
+Check: custom 404 · call to action in the first viewport · per-page
+title + description · share/OG image · favicons · robots.txt · sitemap ·
+alt text on images · layout tested at 375 px · loading states · form
+error messages · confirmation page · real legal mentions · cookie banner
+with a working refuse option · audience measurement · contact address ·
+compressed images.
+Report the missing items to the user instead of inventing them. Internal
+tools and dashboards: only the relevant items apply. Deep audits stay
+with /seo, /harden, /web-validate.