Rewrite domain objects as a Reader/Builder split

Replace the single DomainObject/EncryptableList classes with a read/write split
that removes the optional-event ambiguity:

- base.ts: EventReader<P> (static kind; fromEvent(event, signer?) eagerly computes
  a generic `plain`, validates leniently, throws-or-passes; lazy method accessors;
  group/protect/expires + extraTags carry-over; builder()) and EventBuilder<P>
  (chainable setters, buildTags/buildContent, validate-on-emit).
- List.ts: ListReader/ListBuilder for NIP-51 lists (decrypt-on-read into `plain`,
  re-encrypt-on-emit, tag mutators).
- Every kind converted to a <Noun> reader + <Noun>Builder pair; membership ops
  split into per-kind reader/builder pairs over a shared abstract base.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V67tPYdvh1qCkjEBhJGZUR

packages/domain/src/BlossomServerList.ts

@@ -1,27 +1,35 @@
 import {uniq} from "@welshman/lib"
 import {BLOSSOM_SERVERS, getTagValues, normalizeRelayUrl} from "@welshman/util"
-import {EncryptableList} from "./List.js"
+import {ListReader, ListBuilder} from "./List.js"
 
 // Blossom BUD-03 user server list (kind 10063). Server endpoints are stored as
 // `["server", url]` tags (NOT the `r`/`relay` tags used by relay lists), so the
 // generic relay-tag helpers would miss them. Effectively public-only.
-export class BlossomServerList extends EncryptableList {
-  readonly kind = BLOSSOM_SERVERS
+export class BlossomServerList extends ListReader {
+  static kind = BLOSSOM_SERVERS
 
   servers() {
     return uniq(getTagValues("server", this.tags()).map(normalizeRelayUrl))
   }
 
   includes(url: string) {
-    return this.servers().includes(url)
+    return this.servers().includes(normalizeRelayUrl(url))
   }
 
+  builder() {
+    return this.seedList(new BlossomServerListBuilder())
+  }
+}
+
+export class BlossomServerListBuilder extends ListBuilder {
+  static kind = BLOSSOM_SERVERS
+
   addServer(url: string) {
     return this.addPublicTags(["server", normalizeRelayUrl(url)])
   }
 
   removeServer(url: string) {
-    return this.removeTagsWithValue(url)
+    return this.removeTagsWithValue(normalizeRelayUrl(url))
   }
 
   setServers(urls: string[]) {