fix(git-sync): propagate nested details open; drop dead delete-cap wiring; cover lost-lock abort + lose-prone atom round-trips

Addresses review 1863 (delta) on PR #119.

MUST-FIX:
- detailsToHtml (the raw-HTML path used for a details nested inside
  columns/spanned cells) now emits `<details${open}>`, mirroring the
  top-level case, so `open` no longer silently drops every round trip.
- Remove the dead `resolveApplyClient` delete-cap hook from the engine
  `runCycle`: the orchestrator stopped passing it, so the hook + its
  dry-run pass were inert. Deletes are soft (Trash) + always logged and
  engine convergence is the guard, so no cap is re-added — just the dead
  wiring removed.

TEST COVERAGE:
- space-lock: heartbeat refresh CAS-miss (eval -> 0) and Redis-error
  (eval throws) both abort the in-flight fn's signal.
- cycle: a pre-aborted signal (and an abort during the pull read) throws
  before the push apply / first destructive phase.
- converter: htmlEmbed source VALUE + height survive; encode/decode
  UTF-8 symmetry and '' -> ''; footnote definition body + ref/def id
  match; transclusionReference both ids survive; fix the bad
  transclusionSource fixture (wrong `pageId` attr + empty content ->
  schema `id` + a block child); nested details `open` parity test.
- orchestrator: autoMergeConflicts:true reaches engine settings; default
  false on a missing settings row.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/server/src/integrations/git-sync/services/git-sync.orchestrator.spec.ts

@@ -54,6 +54,12 @@ interface BuildOptions {
   debounceMs?: number;
   /** A hook applied to the fake vault so a test can override its behaviour. */
   vaultOverrides?: Record<string, unknown>;
+  /**
+   * The row `buildSettings` reads for the per-space `autoMergeConflicts` flag
+   * (`executeTakeFirst`). Default: the SAFE off value. Pass `undefined` to model
+   * a missing row (no space / no settings).
+   */
+  settingsRow?: { autoMergeConflicts: boolean } | undefined;
 }
 
 interface Built {
@@ -78,6 +84,10 @@ function build(opts: BuildOptions = {}): Built {
     debounceMs = 2000,
     vaultOverrides = {},
   } = opts;
+  // Distinguish "key omitted" (default off row) from "key present but undefined"
+  // (a deliberately MISSING settings row).
+  const settingsRow =
+    'settingsRow' in opts ? opts.settingsRow : { autoMergeConflicts: false };
   // Distinguish "key omitted" (default to a valid id) from "key present but
   // undefined" (the no-service-user test deliberately sets it undefined).
   const serviceUserId = 'serviceUserId' in opts ? opts.serviceUserId : 'svc-user';
@@ -135,7 +145,7 @@ function build(opts: BuildOptions = {}): Built {
     const builder: any = {
       select: () => builder,
       where: () => builder,
-      executeTakeFirst: async () => ({ autoMergeConflicts: false }),
+      executeTakeFirst: async () => settingsRow,
       execute: async () => [],
     };
     return { selectFrom: () => builder };
@@ -290,6 +300,20 @@ describe('GitSyncOrchestrator', () => {
       });
     });
 
+    it('threads autoMergeConflicts:true from the space settings row into the engine settings', async () => {
+      const built = build({ settingsRow: { autoMergeConflicts: true } });
+      await built.orchestrator.runOnce('space-1', 'ws-1');
+      const [deps] = runCycleMock.mock.calls[0];
+      expect(deps.settings.autoMergeConflicts).toBe(true);
+    });
+
+    it('defaults autoMergeConflicts to false when the settings row is missing', async () => {
+      const built = build({ settingsRow: undefined });
+      await built.orchestrator.runOnce('space-1', 'ws-1');
+      const [deps] = runCycleMock.mock.calls[0];
+      expect(deps.settings.autoMergeConflicts).toBe(false);
+    });
+
     it("surfaces the engine's skipped status (e.g. merge-in-progress) verbatim", async () => {
       const built = build();
       runCycleMock.mockResolvedValue({ ran: false, skipped: 'merge-in-progress' });