Check for only Major version updates in JS deps

[bhoy-troy]

The previous check_cdn_updates.py created GitHub issues for any newer npm version — including patch/minor updates and major upgrades. This caused noise and offered no way to distinguish if an upgrade was necessary.

Solution

Replace the flat version comparison with a dynamic stack resolver that finds the maximum mutually-compatible version for every CDN package by scanning npm metadata (peerDependencies, dependencies, ranged devDependencies) across all packages deployed in templates/layout.html.

Changes

• Replaced top-level functions with three classes: StackResolver, LayoutParser, LtsPolicy
• StackResolver: owns all npm I/O and semver logic
• LayoutParser: parses <script src> / from HTML to extract deployed versions and CDN URLs
• LtsPolicy: classifies results, prints output, writes cdn-update-report.md
• Optimised npm I/O: one HTTP request per package
• Fixed missing @classmethod decorator on check_semver_constraint
• Added --verbose flag: writes cdn-update-report.md

[coderabbitai]

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