feat: ContentGuardianAgent, onboarding UX, Team Activity action wiring, docs, agent help modal

ContentGuardianAgent consolidation:
- Merge 3 duplicate classes into single source in specialized/content_guardian.py
- Watchdog audit_committee() with heuristic scoring, coverage gaps, overlaps, alerts
- Remove misleading rejection_rate() helper; use acceptance_rate directly
- Integrate audit + alerts + trend signals into today_workflow_service.py

Team Activity page:
- QualityAuditPanel: health ring, per-agent critiques, coverage gaps, overlaps
- TrendSignalsPanel: opportunity cards with urgency/impact/coverage bars
- AlertBanner: persistent dismiss via POST /alerts/{id}/mark-read
- AgentHelpModal: dialog showing all 8 agents with descriptions, tools, schedule
- QualityAuditPanel action buttons: Fill gap -> /content-planning, Resolve overlap, View CTA on alerts/issues
- TrendSignalsPanel action buttons: Create content from this trend -> /blog-writer with trend context state

Onboarding system:
- Step 4 validation: no auto-pass via basic_ready; requires persona data or explicit progression
- Step 5 validation: logs warning on auto-pass without integration data
- OnboardingCompletionService: single DB session, transactional task creation, upsert pattern
- Business-without-website: nullable website_url on SIFIndexingTask and MarketTrendsTask
- DeepCompetitorAnalysisExecutor: 5-min timeout, 10-competitor cap, asyncio.wait_for
- Persona generation: async with 30s timeout, falls back to scheduler
- OnboardingProgressService.reset_onboarding(): resets session + pauses all DB tasks
- OnboardingControlService.reset_onboarding(): also cancels APScheduler jobs
- FinalStep TaskSchedulingPanel: shows scheduled/failed tasks after completion, 8s auto-redirect
- onboarding_completed agent activity event logged to feed

Documentation:
- docs-site/features/onboarding/: overview, steps, scheduler-tasks, technical-reference (4 pages)
- docs-site/mkdocs.yml: added Onboarding System nav section
- docs-site/features/sif-agents/: overview, agent-directory, committee-system, content-guardian (4 pages)
- docs-site/features/team-activity/: overview, quality-audit, trend-signals, alert-system (4 pages)
- docs-site/features/todays-workflow/: updated overview, technical-architecture, workflow-guide, api-reference

frontend/src/components/WixTestPage/WixTestPage.tsx

@@ -18,6 +18,7 @@ import {
 import { apiClient } from '../../api/client';
 import { createClient, OAuthStrategy } from '@wix/sdk';
 import { categories as blogCategoriesModule, tags as blogTagsModule } from '@wix/blog';
+import { WIX_CLIENT_ID, getWixRedirectOrigin } from '../../config/wixConfig';
 
 interface WixConnectionStatus {
   connected: boolean;
@@ -108,11 +109,10 @@ This integration opens up new possibilities for content creators who want to lev
     setLoading(true);
     try {
       const wixClient = createClient({
-        auth: OAuthStrategy({ clientId: '75d88e36-1c76-4009-b769-15f4654556df' })
+        auth: OAuthStrategy({ clientId: WIX_CLIENT_ID })
       });
 
-      const NGROK_ORIGIN = process.env.REACT_APP_NGROK_ORIGIN || 'https://littery-sonny-unscrutinisingly.ngrok-free.dev';
-      const redirectOrigin = window.location.origin.includes('localhost') ? NGROK_ORIGIN : window.location.origin;
+      const redirectOrigin = getWixRedirectOrigin();
       const redirectUri = `${redirectOrigin}/wix/callback`;
       const oauthData = await wixClient.auth.generateOAuthData(redirectUri);
       // Use sessionStorage to ensure data is scoped to this tab/session
@@ -131,7 +131,7 @@ This integration opens up new possibilities for content creators who want to lev
       const tokensRaw = sessionStorage.getItem('wix_tokens');
       if (!tokensRaw) throw new Error('Missing Wix tokens');
       const tokens = JSON.parse(tokensRaw);
-      const wixClient = createClient({ modules: { categories: blogCategoriesModule }, auth: OAuthStrategy({ clientId: '75d88e36-1c76-4009-b769-15f4654556df' }) });
+      const wixClient = createClient({ modules: { categories: blogCategoriesModule }, auth: OAuthStrategy({ clientId: WIX_CLIENT_ID }) });
       wixClient.auth.setTokens(tokens);
       const result = await wixClient.categories.queryCategories().find();
       const cats = (result.items || []).map((c: any) => ({ id: c.id, name: c.name || '', description: c.description || '' }));
@@ -147,7 +147,7 @@ This integration opens up new possibilities for content creators who want to lev
       const tokensRaw = sessionStorage.getItem('wix_tokens');
       if (!tokensRaw) throw new Error('Missing Wix tokens');
       const tokens = JSON.parse(tokensRaw);
-      const wixClient = createClient({ modules: { tags: blogTagsModule }, auth: OAuthStrategy({ clientId: '75d88e36-1c76-4009-b769-15f4654556df' }) });
+      const wixClient = createClient({ modules: { tags: blogTagsModule }, auth: OAuthStrategy({ clientId: WIX_CLIENT_ID }) });
       wixClient.auth.setTokens(tokens);
       const result = await wixClient.tags.queryTags().find();
       const t = (result.items || []).map((it: any) => ({ id: it.id, label: it.label || '' }));