Route documentation home to quick start

.agents/notes/implemented/simplification/2026-08-11-quickstart-documentation-home.md

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+# Agent Note: Route documentation roots to quick start
+
+Status: implemented
+
+English | [中文](2026-08-11-quickstart-documentation-home.zh.md)
+
+## Problem
+
+A separate documentation landing page duplicates product positioning and feature summaries owned by the product landing page. Those parallel claims require synchronization and review without helping readers reach technical instructions.
+
+## Decision
+
+Each locale root is a redirect page. `/` sends readers to `./guide/quickstart`, and `/en/` resolves the same relative target to `/en/guide/quickstart`. The relative target preserves the configured `DOCS_BASE` when the site is hosted below an origin path.
+
+`docs/user/index.md` and `docs/user/index.zh.md` own the redirect as VitePress frontmatter. The [documentation-site projector](../process/2026-07-13-documentation-site-projection.md) publishes only that frontmatter for locale homes, so the canonical Markdown retains its bilingual switcher without rendering a second landing page. The projector test verifies that both locale roots use the same locale-relative quick-start target.
+
+Product positioning and feature summaries stay outside the documentation site. Guide, development, reference, search, and locale navigation remain available from the quick-start page.
+
+## Alternatives considered
+
+**Keep a documentation hero and synchronize its wording.** This preserves a promotional entry page but creates a second product narrative whose claims and terminology can drift from the product landing page.
+
+**Render a documentation index at the root.** An index repeats the navigation already provided by the site and inserts another choice before the first actionable guide.
+
+**Copy quick-start content to each locale root.** Two public routes would then own the same tutorial and require another synchronization mechanism.
+
+**Use origin-absolute redirect targets.** Paths such as `/guide/quickstart` ignore `DOCS_BASE` and fail when the documentation site is hosted below an origin path.
+
+## Consequences
+
+Readers entering either locale root immediately reach the quick-start tutorial in that locale. The documentation site gives up a promotional home surface, while the product landing page remains the single owner of positioning and feature summaries. The stable root routes remain valid entry points, and quick-start content retains one canonical source.