[SaladDay]

Deletes documentation that has no use now, found by an audit of every authored page against the current code. Every deleted fact still exists in its owning document, or describes something that no longer exists.

• Duplicates removed. Text that restated another document's facts is gone from these places. Where a page needs the fact, it now links to the owner.
  • Environment input admission, now owned by Sessions and events.
  • The Web product and design guides.
  • Console API usage.
  • Implementation constraints.
  • The provider helper READMEs.
  • Deployment, CONTRIBUTING and maintainers.
  • The architecture, workspace and sandbox Provider protocol pages.
  • Install options and Configuration's "Independent workspace storage", now owned by Set up workspace storage.
• Obsolete statements removed or corrected.
  • Managed HTTPS and domain actions, and config.json (including two Web code comments).
  • Harness-level workspace reads, and the deleted TestUnsupportedExtensionsHaveNoNativeEffects, which is also dropped from make check-runtime-contract.
  • The microsandbox helper wire version 7 (it is 8).
  • The MiniMax functions and multi_agent rejection.
  • sandbox_node_id as an example member.
  • The website README redirect clause.
  • The Caddy hop in the quick-tunnel guide: Web on 8080 already routes /v1, /api/v1 and /docs.
• Unreferenced files deleted. The stale apps/web/.impeccable sidecar and four console screenshots in docs/assets.
• Links fixed.
  • The nodes page reset link now points to the Reset section.
  • The runtime-observability code paths are corrected.
• Chinese mirrors. Each English edit under docs/ and contracts/agents-api/ is mirrored in Chinese, and every source_hash is refreshed.

Checks:

• make check-docs
• make check-runtime-contract
• pnpm --dir website check-translations (3/3)
• vitepress build, which reports no dead links
• Website tests (28/28)

A fresh independent review checked for lost facts, dangling references, links, translations and boundaries. Its findings are fixed in this PR.

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