feat(worker): add hg-edge and bugzilla pollers

Wires two historical sources for completeness with the 2019 timeline:

- hg-edge.mozilla.org: scans json-pushes for a configured set of
  build/* repos and matches changeset author client-side, since the
  pushlog `user=` filter targets the pusher (sheriffs/reviewers in
  this case) rather than the author. Daily poll cadence — mozilla
  retired hg, no new events expected.
- bugzilla.mozilla.org: queries /rest/bug?creator=<email>. Without
  an api key the unauthenticated endpoint only returns public bugs,
  which is what the public timeline wants anyway.

Reshape renders "<author> committed <short_node> in <repo>" for hg
and "filed bug #<id> in <product>" for bugzilla, both linking back
to the canonical upstream URL via a stamped `_host` payload field.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

crates/moments-core/src/presentation.rs

@@ -3,31 +3,18 @@
 //! Storage holds the upstream payload verbatim; transformation lives here so
 //! the rendering can evolve without re-fetching upstream data.
 
-use moments_entities::{Event, Source, TimelineIcon, TimelineItem, TitleSegment};
+use moments_entities::{Event, Source, TimelineItem};
 
+mod bugzilla;
 mod gitea;
 mod github;
+mod hg;
 
 pub fn reshape(event: &Event) -> TimelineItem {
     match event.source {
         Source::Github => github::reshape(event),
         Source::Gitea => gitea::reshape(event),
-        Source::Hg | Source::Bugzilla => generic_fallback(event),
-    }
-}
-
-fn generic_fallback(event: &Event) -> TimelineItem {
-    TimelineItem {
-        id: event.id.clone(),
-        source: event.source,
-        action: event.action.clone(),
-        occurred_at: event.occurred_at,
-        icon: TimelineIcon::Generic,
-        title: vec![
-            TitleSegment::text(format!("{} from ", event.action)),
-            TitleSegment::text(event.source.as_str().to_string()),
-        ],
-        subtitle: None,
-        body: None,
+        Source::Hg => hg::reshape(event),
+        Source::Bugzilla => bugzilla::reshape(event),
     }
 }