[codex] add share support growth kit

[offyotto]

What changed

• Added an in-app About > Share surface with Copy Pitch, Copy Post, Copy Snapshot, and quick links to the website, latest release, and GitHub.
• Added CoreMonitorShareKit to generate canonical product/share text and privacy-safe support snapshots without process names.
• Added focused share-kit tests and wired them into the Xcode test target.
• Refreshed README, website structured data, FAQ, llms.txt, llms-full.txt, and AI discovery guidance around the new share/support flow and canonical offyotto links.
• Strengthened Mac App Store discovery signals so Core-Monitor points users toward the official Apple listing.
• Added direct Apple App Store alternate links, SoftwareApplication structured data, and canonical App Store CTAs across the Mac App Store landing/support/privacy pages.
• Added docs/MAC_APP_STORE_ASO.md with paste-ready App Store Connect metadata for name, subtitle, keywords, promotional text, and description copy.
• Cleaned duplicate sitemap entries and refreshed lastmod dates for the canonical public pages.
• Added a Codex Run action wired to the existing ./script/build_and_run.sh entrypoint.

Why

This gives Core-Monitor a low-friction word-of-mouth and support loop: users can copy accurate recommendation text, launch-style posts, or useful hardware/helper context directly from the app without telemetry or process-name exposure.

It also directly addresses App Store discoverability. Web search was finding the Core-Monitor site and Mac App Store landing page, but not consistently surfacing the Apple-hosted listing for core-monitor. The repo now pushes the official Apple listing from every relevant public surface, and the ASO playbook gives App Store Connect metadata that should help Apple in-store search once applied.

Validation

• xcodebuild -project Core-Monitor.xcodeproj -scheme Core-Monitor -destination 'platform=macOS,arch=arm64' -derivedDataPath .codex-build/DerivedData CODE_SIGNING_ALLOWED=NO test
• ./script/build_and_run.sh --verify
• xmllint --noout sitemap.xml
• JSON-LD parse check for index.html, docs/index.html, Mac-App-Store/index.html, and docs/Mac-App-Store/index.html
• git diff --check