docs(pages): refresh public kaefa site

[seonghobae]

Outcome

Refresh the existing GitHub Pages source without changing package runtime behavior.

• add a modern index.md landing page for kaefa's current AEFA product scope;
• include exactly one Ask DeepWiki badge linked to https://deepwiki.com/ContextualWisdomLab/kaefa;
• replace the 2017-era public-site framing with current aefa() / engineAEFA(), Shiny, remote-execution, architecture, onboarding, releases, and evidence boundaries;
• update the Jekyll site title/description while preserving the existing Cayman theme;
• preserve the existing custom-domain CNAME (kaefa.seonghobae.me) unchanged.

Existing Pages evidence

The current gh-pages branch is still at the 2017 lineage and its README points to the pre-organization seonghobae/kaefa repository and old CI surfaces. This change adds an explicit Jekyll index.md so the public landing page no longer depends on that stale historical README.

This PR does not claim publication merely because source changed. Merge through normal governance, then verify the live custom-domain/GitHub Pages response before treating the public site as updated.

Coordination

Default-branch docs PR #81 owns README.Rmd/generated README.md and ADR pointers. This Pages PR is intentionally isolated to the existing gh-pages source branch so it does not compete with that writer. Root README badge/organization-link cleanup should be coordinated through #81 rather than duplicated here.

Safety boundary

No CNAME change, Pages settings mutation, package code change, force-push, or branch-protection bypass is included.

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