🩹 fix: Bump GitNexus to 1.6.5 and Fail-Soft the PR Index Job (#13569)

* 🩹 fix: Bump GitNexus to 1.6.5 and Fail-Soft the PR Index Job

The GitNexus Index workflow began failing on most PRs with
"Analysis failed: Maximum call stack size exceeded". Root cause is in
the pinned gitnexus@1.5.3 CLI: pipeline.js does
`deferredWorkerCalls.push(...chunkWorkerData.calls)`, and once a chunk
yields more extracted calls than V8's argument-count limit (~125k on
this repo) the spread-push throws a RangeError. It is deterministic on
repo size, not flaky — LibreChat simply grew past the threshold, so it
fails "more often" as more branches cross it. Stack-size flags don't
help; it's an arg-count limit, not stack depth.

gitnexus@1.6.5 refactored that code path (the .calls spread-pushes are
gone) and indexes this repo cleanly. Bump the indexer, the deploy image
tag/build-arg, and the Dockerfile default in lockstep (an index written
by 1.6.5 must be served by a 1.6.5 server), and move the co-pinned
@ladybugdb/core to 0.16.1 to match.

Also make the index job fail-soft on pull_request events so a future
tool-internal crash degrades gracefully instead of red-X'ing PRs. Push,
dispatch, and /gitnexus command runs still fail loudly, keeping the
deploy-gating and completion-comment logic correct.

* 🐳 fix: Unbreak the GitNexus Deploy Image for 1.6.5

Addresses two issues in the deploy image surfaced after the 1.6.5 bump:

- The image build's lbug-adapter patch grepped
  dist/mcp/core/lbug-adapter.js for "LOAD EXTENSION fts", but in 1.6.5
  that file is a shim re-export and the FTS load moved to
  dist/core/lbug/lbug-adapter.js. The grep would fail the build on the
  next image rebuild. The patch is also obsolete: 1.6.5 loads the vector
  extension itself via loadVectorExtension. Removed the patch step.

- The image installed only gitnexus, letting @ladybugdb/core resolve
  freely via gitnexus's ^0.16.1 range while the index workflow pins
  0.16.1 exactly. Pin the native DB in the image too (nested under
  gitnexus so install-extensions.js keeps resolving it), restoring the
  intended indexer/server lockstep.

.github/workflows/gitnexus-deploy.yml

@@ -84,7 +84,7 @@ concurrency:
   cancel-in-progress: false
 
 env:
-  GITNEXUS_VERSION: '1.5.3'
+  GITNEXUS_VERSION: '1.6.5'
   IMAGE_NAME: ghcr.io/${{ github.repository_owner }}/librechat-gitnexus
 
 jobs:

.github/workflows/gitnexus-index.yml

@@ -43,7 +43,7 @@ concurrency:
   cancel-in-progress: true
 
 env:
-  GITNEXUS_VERSION: '1.5.3'
+  GITNEXUS_VERSION: '1.6.5'
 
 jobs:
   index:
@@ -64,6 +64,9 @@ jobs:
       github.event.pull_request.user.login == 'danny-avila'
     runs-on: ubuntu-latest
     timeout-minutes: 25
+    # Best-effort index: a tool-internal crash must not block PRs. Fail soft on
+    # PR events; push/dispatch runs still fail loudly so regressions stay visible.
+    continue-on-error: ${{ github.event_name == 'pull_request' }}
     steps:
       - name: Validate dispatch inputs
         if: github.event_name == 'workflow_dispatch'
@@ -162,7 +165,7 @@ jobs:
             --no-save \
             --no-package-lock \
             "gitnexus@${{ env.GITNEXUS_VERSION }}" \
-            "@ladybugdb/core@0.15.2"
+            "@ladybugdb/core@0.16.1"
           test -x "$RUNNER_TEMP/gitnexus-cli/node_modules/.bin/gitnexus"
 
       - name: Checkout repository