fix(git-sync): address review — configurable poll, always-on loop-guard, cleanup

Comprehensive-review follow-ups (APPROVE WITH SUGGESTIONS; no critical issues):
- poll interval is now actually configurable: replaced the hardcoded
  @Interval('git-sync-poll', 15000) with a dynamic SchedulerRegistry interval
  registered in onModuleInit from getGitSyncPollIntervalMs() (cleared in
  onModuleDestroy); /status and the real cadence now share one config source.
  Boots logging 'poll interval registered (Nms)'.
- loop-guard now ALWAYS applies: the lastUpdatedSource==='git-sync' skip was
  nested inside the !spaceId/!workspaceId branch, so structural self-writes
  (CREATE/MOVE/RESTORE/SOFT_DELETE, which carry spaceId+workspaceId) bypassed it
  and re-triggered cycles. Fetch the page row once, guard unconditionally, then
  resolve space/workspace.
- remove the dead PAGE_CONTENT_UPDATED subscription (it's a BullMQ job, never an
  EventEmitter event; body edits arrive via PAGE_UPDATED).
- fix the stale datasource comment (PageService DOES stamp 'git-sync' now).
- env getters: parseInt radix 10 + NaN/<=0 fallback for poll/debounce (+ max
  deletes), with 6 new environment.service.spec tests.

tsc clean; jest 723 pass; live cycle re-verified post-refactor (ran, push
applied, unflagged 92-page space untouched).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

apps/server/src/integrations/git-sync/git-sync.constants.ts

@@ -13,14 +13,16 @@ import { EventName } from '../../common/events/event.contants';
  * The page lifecycle events the git-sync listener reacts to (plan §10). A change
  * to any of these in an enabled space schedules a debounced sync cycle.
  *   - PAGE_CREATED / PAGE_UPDATED / PAGE_MOVED — structural + content edits;
- *   - PAGE_CONTENT_UPDATED — the collab body-save job (real name in the enum);
  *   - PAGE_SOFT_DELETED / PAGE_RESTORED — Trash transitions (deletes are soft);
  *   - PAGE_MOVED_TO_SPACE — cross-space move (cross-repo, plan §5).
+ *
+ * NOTE: body edits arrive via PAGE_UPDATED (emitted from persistence.extension),
+ * NOT via EventName.PAGE_CONTENT_UPDATED — that name is a BullMQ queue-job name,
+ * not an EventEmitter2 event, so @OnEvent would never fire for it.
  */
 export const GIT_SYNC_PAGE_EVENTS = [
   EventName.PAGE_CREATED,
   EventName.PAGE_UPDATED,
-  EventName.PAGE_CONTENT_UPDATED,
   EventName.PAGE_MOVED,
   EventName.PAGE_MOVED_TO_SPACE,
   EventName.PAGE_SOFT_DELETED,