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/environment/environment.service.ts

@@ -348,18 +348,28 @@ export class EnvironmentService {
     return this.configService.get<string>('GIT_SYNC_REMOTE_TEMPLATE');
   }
 
-  /** Poll-safety interval in ms (default 15000). */
+  /**
+   * Poll-safety interval in ms (default 15000). A NaN / non-positive value falls
+   * back to the default so a bad override can never disable or zero the poll loop.
+   */
   getGitSyncPollIntervalMs(): number {
-    return parseInt(
+    const parsed = parseInt(
       this.configService.get<string>('GIT_SYNC_POLL_INTERVAL_MS', '15000'),
+      10,
     );
+    return Number.isFinite(parsed) && parsed > 0 ? parsed : 15000;
   }
 
-  /** Event debounce window in ms (default 2000). */
+  /**
+   * Event debounce window in ms (default 2000). A NaN / non-positive value falls
+   * back to the default so a bad override can never disable the debounce.
+   */
   getGitSyncDebounceMs(): number {
-    return parseInt(
+    const parsed = parseInt(
       this.configService.get<string>('GIT_SYNC_DEBOUNCE_MS', '2000'),
+      10,
     );
+    return Number.isFinite(parsed) && parsed > 0 ? parsed : 2000;
   }
 
   /**
@@ -372,6 +382,7 @@ export class EnvironmentService {
   getGitSyncMaxDeletesPerCycle(): number {
     const parsed = parseInt(
       this.configService.get<string>('GIT_SYNC_MAX_DELETES_PER_CYCLE', '5'),
+      10,
     );
     return Number.isFinite(parsed) && parsed > 0 ? parsed : 5;
   }