v2.1.0 - v2.1.0: Refresh all five guides for October 2026

aws-spa-deploy - Fixed a build cache that never worked (npm ci deletes node_modules), wrong CORS guidance for HTTP API, and stale SES/ACM/Free Tier costs; moved to Node.js 24 (CDK 2.224.0+), added the function URL 403 permission change, SESv2 contact-form handler, security headers, and corrected SES sandbox and production-access facts

google-analytics-4 - Fixed SPA advice that double-counted page views (history-based page views stay on even with send_page_view: false); conversions renamed to key events with current Admin paths; corrected internal traffic filter steps and added hostname filters; Consent Mode now covers Switzerland, basic vs advanced, and the June 2026 Google Ads change; removed false BigQuery backfill and attribution claims; added Google tag gateway and the GTM gtag.config change

seo-llmo - Rebuilt AI crawler guidance (GPTBot and ClaudeBot are training crawlers; AI search uses OAI-SearchBot, Claude-SearchBot and others; Google-Extended does not control AI Overviews); FAQ rich results retired and llms.txt not used by Google Search; A2A Agent Card v1.0, Agent Skills index v0.2.0, and MCP discovery via SEP-2127 Server Card and AI Catalog; ORA moved to ora.ai; "explicit absence" now declares missing A2A/MCP in llms.txt with Markdown 404s instead of spec-invalid stub files

web-accessibility - Fixed Focus Appearance mislabelled as 2.4.11 AA (it is 2.4.13 AAA) and added Focus Not Obscured; audio CAPTCHA no longer presented as passing Accessible Authentication; recalculated contrast ratios; added ADA Title II deadlines, precise EAA scope and EN 301 549 status; native <dialog> pattern and Baseline table for new HTML features; WebAIM 2026 screen reader data

web-performance - Next.js 16 APIs (fetchPriority/preload, proxy.ts, 'use cache'); fixed a GTM snippet that broke page view triggers, a backwards font-display: swap description, and an invented Vite flag; Lighthouse 13 insights and weights; fetchpriority vs preload rule; no-cache without no-store for bfcache; AVIF Baseline and JPEG XL status; added zstd compression and bfcache/Speculation Rules

all skills - Rewrote skill descriptions to match the refreshed content; seo-llmo description now under the 1024-character Agent Skills limit; added a marketplace description