M8: GUI polish, n8n workflow-3 fixes, RAGcore retrieval root-cause and fix

GUI: dashboard Attention Queue presents a curated severity mix instead of pure
severity-sort (grouped Now/Today/Later headers); Today's Movements seed data
curated so a fresh reset shows a credible day (2+ departures, 2+ returns), with
a new seed-integrity test; About Demo restructured into a compact grid with
progressive disclosure for technical sections; Duplicate Merge shows match/conflict
counts, hides matching fields by default, and previews the final merged record
before confirmation.

Repo hygiene: removed a stray empty `backend;C` directory and an untracked 31MB
zip export; `.gitignore` now excludes future archive exports.

n8n: fixed invalid JSON (a missing `},` between two node objects) in the committed
`fleet-ops-vehicle-return.json` -- the file could not be parsed. Live-validated
workflow 3 (RAGcore Procedure Sync): found and fixed a real defect (three body
parameters had a stray trailing `}}`) and a missing Error Workflow wiring, both
via the safe `n8n import:workflow` CLI path; exported the corrected, still-
inactive workflow as the new source of truth and updated MANIFEST.md/check_drift.py.
Publishing it (starts real daily unattended runs) remains a separate decision.

RAGcore: root-caused and fixed (live, approved) the "zero retrieval candidates"
bug -- a filesystem permission bug (`embedding_profiles.json` unreadable by the
app's own runtime user) that broke every retrieval call before it reached Qdrant.
Every other suspect (grants, scope resolution, Qdrant filters, embeddings) was
verified healthy first. Found a second, deeper gap: the reranker adapter calls
an Ollama HTTP route that does not exist on the deployed Ollama version, so
`/v1/answers` still returns `not_answerable`. `KNOWLEDGE_PROVIDER` stays `demo`
until that is resolved on the RAGcore side. Evidence-based MCP Hub integration
status (real tool-call audit history, not just a boolean flag) replaces the old
`configured`/`not_configured` guess. Full findings in
`docs/final-integrations/current-state-audit.md`.

Backend: 172 tests passing, ruff clean, mypy clean (50 files). Frontend: tsc
clean, production build clean.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

backend/app/api/routers/integration_status.py

@@ -4,16 +4,10 @@ from fastapi import APIRouter, Depends
 from sqlalchemy.orm import Session
 
 from app.api.deps import get_db, require_operations_manager
-from app.core.config import get_settings
-from app.schemas import (
-    CurrentUser,
-    IntegrationStatusOut,
-    McpHubIntegrationStatus,
-)
-from app.services.integration_status import derive_n8n_status
+from app.schemas import CurrentUser, IntegrationStatusOut
+from app.services.integration_status import derive_mcp_hub_status, derive_n8n_status
 
 router = APIRouter(prefix="/api/v1/integrations", tags=["integrations"])
-settings = get_settings()
 
 
 @router.get("/status", response_model=IntegrationStatusOut)
@@ -23,8 +17,5 @@ def integration_status(
 ) -> IntegrationStatusOut:
     return IntegrationStatusOut(
         n8n=derive_n8n_status(db),
-        mcp_hub=McpHubIntegrationStatus(
-            registration_enabled=settings.mcp_hub_registration_enabled,
-            state="configured" if settings.mcp_hub_registration_enabled else "not_configured",
-        ),
+        mcp_hub=derive_mcp_hub_status(db),
     )