refactor: separate Feed domain state from persistence DTO

Move four DDD tensions on the Feed aggregate to ground:

- #1 The aggregate now holds a domain FeedState (camelCase) instead of the
  snake_case FeedConfig DTO; infrastructure/feed-mapper.ts owns the
  FeedState<->FeedConfig/FeedListItem translation as the sole snake_case site
  outside the HTTP edge.
- #3 Replace the edit() recomputeExpiry control flag with a Lifetime VO:
  passing a lifetime recomputes expiry, omitting it preserves the current one
  (the dashboard quick-edit path).
- #4 Domain events carry their own feedId; dispatchFeedEvents centralizes the
  drain+dispatch in the application layer (no more manual pullEvents at call
  sites), keeping infra->application dependency direction intact.
- #6 Rename FeedId.fromTrusted to FeedId.unchecked to make the absence of
  revalidation explicit.

Adds Lifetime + feed-mapper round-trip tests. 353 tests green, tsc clean,
wrangler dry-run OK. Docs (CLAUDE.md) synced.

Co-Authored-By: Claude Opus 4.7 <[email protected]>

src/infrastructure/feed-mapper.ts

@@ -0,0 +1,51 @@
+import { FeedConfig, FeedListItem } from "../types";
+import { FeedState } from "../domain/feed-state";
+import { FeedId } from "../domain/value-objects/feed-id";
+
+/**
+ * The translation seam between the Feed aggregate's domain state (camelCase) and
+ * the persistence/edge DTOs (`FeedConfig`/`FeedListItem`, snake_case). This is
+ * the ONLY place outside the HTTP edge that knows the stored field names — the
+ * domain stays free of the storage dialect, and the repository round-trips
+ * through here on every load/save.
+ */
+
+/** Persisted config DTO → domain state (used by `FeedRepository.load`). */
+export function fromConfigDTO(dto: FeedConfig): FeedState {
+  return {
+    title: dto.title,
+    description: dto.description,
+    language: dto.language,
+    author: dto.author,
+    allowedSenders: dto.allowed_senders ?? [],
+    blockedSenders: dto.blocked_senders ?? [],
+    createdAt: dto.created_at,
+    updatedAt: dto.updated_at,
+    expiresAt: dto.expires_at,
+  };
+}
+
+/** Domain state → persisted config DTO (used by `FeedRepository.save`). */
+export function toConfigDTO(state: FeedState): FeedConfig {
+  return {
+    title: state.title,
+    description: state.description,
+    language: state.language,
+    author: state.author,
+    allowed_senders: state.allowedSenders,
+    blocked_senders: state.blockedSenders,
+    created_at: state.createdAt,
+    updated_at: state.updatedAt,
+    expires_at: state.expiresAt,
+  };
+}
+
+/** Domain state → the projection cached in the global `feeds:list` registry. */
+export function toListItemDTO(id: FeedId, state: FeedState): FeedListItem {
+  return {
+    id: id.value,
+    title: state.title,
+    description: state.description,
+    expires_at: state.expiresAt,
+  };
+}