Add lightweight website measurement and improvement loop

[masarray]

What changed

• add an optional local analytics client that remains a no-op until a valid GA4 measurement ID is configured
• measure page views, installer/portable/checksum clicks, language switches, 404 events and browser LCP/CLS/INP
• respect Do Not Track and disable Google advertising and ad-personalization signals
• inject the public measurement ID only at deploy time instead of storing it in templates
• validate instrumentation across all 46 registered product pages while leaving Search Console verification HTML untouched
• block deployment for broken local links, missing fragments or unresolved measurement placeholders
• add a weekly and manually runnable private report for most visited pages, English vs Indonesian traffic, download clicks and recurring 404 paths
• query Search Console for top queries, impressions, clicks, CTR, average position and low-CTR opportunities
• collect PageSpeed/CrUX Core Web Vitals with Lighthouse lab fallback when field data is unavailable
• verify deployed sitemap pages, official release assets and actual GitHub Pages 404 behavior
• keep aggregate Markdown/JSON reports in GitHub Actions artifacts rather than publishing them on the website
• document read-only variables/secrets, event names, thresholds and the continuous-improvement loop

Data sources

• GA4 Data API: aggregate page views, event counts and 404 paths
• Search Console API: queries, pages, clicks, impressions, CTR and position
• PageSpeed Insights / CrUX: LCP, CLS and INP field evidence
• deterministic site crawler: internal links, fragments, deployed pages, release assets and 404 status

Safe defaults

The website remains fully functional with measurement disabled until GA4_MEASUREMENT_ID is configured. The reporting engine clearly marks GA4, Search Console or CrUX data unavailable when read-only credentials or sufficient field samples are absent; it never fabricates metrics.

Validation

• latest-main merge validation: passed
• deterministic 46-page product website build: passed
• optional measurement injection and no-op mode: passed
• page/download/language/404/Core Web Vitals instrumentation contract: passed
• Do Not Track and advertising-signal boundaries: passed
• internal links and fragment anchors: 0 errors, 0 warnings
• offline/no-credential report generation: passed
• private quality artifact generation: passed
• existing source/template/SEO/IndexNow/public-boundary contracts: passed
• ARSAS source, premium UX, GOOSE and SAS invariants: passed
• ARIEC61850 API compatibility: passed
• .NET restore and Windows compile: passed
• portable x64 publish and artifact upload: passed

The scheduled remote GA4/Search Console/PageSpeed report is intentionally not executed on pull requests. It runs weekly or manually after the read-only repository configuration is present.

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