docs: publish Claim2Core direction and merged scheduler semantics

[gthulhu-work]

Summary

Bring the official website documentation up to date with the current Gthulhu architecture direction and the scheduler behavior already merged in late August.

Website updates

• rework the English and Chinese homepages around Claim2Core / DRA-aware runtime execution;
• add dedicated English and Chinese Claim2Core architecture/roadmap pages;
• update How It Works in both languages to document:
  • TID-aware /proc/<tgid>/task/<tid> node-policy matching from Gthulhu/Gthulhu#135;
  • TID-first strategy lookup with TGID fallback from Gthulhu/plugin#17;
  • Priority > 0 boost vs Priority == 0 non-boosting semantics;
  • kernel-mode handling from Gthulhu/Gthulhu#137 and the current slice-only limitation;
• update site navigation and site description to expose Claim2Core as an architecture page.

Important scope

The docs distinguish implemented behavior from roadmap work. ResourceClaim binding, DRAExecutionPolicy, preview/provenance, and closed-loop control are documented as planned work rather than existing features.

Related: Gthulhu/Gthulhu#141, #133, #134, #135, #137, Gthulhu/plugin#17.

[Copilot]

🟢 Approval recommended

Changes are documentation-only, internally consistent across nav and i18n structure, and all newly referenced pages/files are present.

Pull request overview

This PR updates the website documentation to reflect the current “Claim2Core” architecture direction and the already-merged scheduler semantics (thread-aware matching, TID-first lookup with TGID fallback, and clarified priority behavior), in both English and Chinese.

Changes:

• Reworked the English and Chinese homepages around Claim2Core and runtime execution semantics.
• Updated “How It Works” (EN/ZH) to document the merged scheduler semantics and current limitations (including kernel-mode slice-only parity).
• Added new Claim2Core roadmap/architecture pages (EN/ZH) and exposed them via site navigation.

File summaries

File	Description
mkdocs.yml	Updates site description, introduces an Architecture nav section, adds Claim2Core page to nav, and aligns zh nav translations.
docs/index.md	Refreshes the English homepage messaging and links to emphasize Claim2Core and recent scheduler semantics.
docs/index.zh.md	Refreshes the Chinese homepage messaging and links to emphasize Claim2Core and recent scheduler semantics.
docs/how-it-works.md	Updates English “How It Works” to document thread-aware matching, lookup semantics, priority semantics, kernel-mode limitation, and Claim2Core direction.
docs/how-it-works.zh.md	Updates Chinese “How It Works” with the same semantics and limitation coverage plus Claim2Core direction.
docs/claim2core.md	Adds an English Claim2Core roadmap/architecture page with boundaries, invariants, and phased plan.
docs/claim2core.zh.md	Adds a Chinese Claim2Core roadmap/architecture page with boundaries, invariants, and phased plan.

Review details

• Files reviewed: 7/7 changed files
• Comments generated: 0
• Review effort level: Lite

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