Sb Dev Sync Docs

Keep bilingual documentation aligned

Public user guides are paired by relative path:

docs/en/<relative-path>
docs/ja/<relative-path>

English is published at /; Japanese is published at /ja/. Japanese remains the practical authoring source for new product explanations, but an edit in either language must not silently leave its counterpart with different behavior, commands, ownership boundaries, warnings, or navigation.

Scope

Apply this workflow to index.md and guide/**/*.md below both language roots. docs/en/reference/ is intentionally English-only. Internal architecture, Decision, repository, contributor, and forward-test documents outside the two language roots are not translation pairs.

Workflow

1. Inspect the requested change and the current Git diff. Identify every affected public page and its same-relative-path counterpart.
2. Read both complete pages. When Japanese content is created, edited, or reviewed for readability, also read the Japanese style reference. When the edit changes product behavior, commands, paths, or ownership, verify the current source or accepted Decision instead of translating an assumption.
3. Preserve meaning, information architecture, examples, warnings, and link destinations, but write natural documentation for each audience rather than translating sentence by sentence. Edit both counterparts when meaning or information structure changes. For a Japanese-only wording improvement, inspect the English counterpart but do not manufacture an English edit when its meaning and structure already agree.
4. If one counterpart does not exist, create it. If a page is intentionally language-specific, confirm that it is outside the paired scope or obtain an explicit decision to defer it; report the deferral and its tracking location. Do not call the bilingual change complete while drift is merely unmentioned.
5. For a move or removal, apply the same relative-path change to both trees and update mkdocs.yml, inbound links, contributor guidance, and any public URL embedded in code or tests.

Verification

Run from the repository root:

python -m mkdocs build --strict
git diff --check

Confirm the generated English and Japanese pages exist at corresponding paths and that their language selector links point to each other. When a public URL is a CLI contract, also update its source, focused tests, and accepted Decision, then run the focused test and python scripts/check_decisions.py.

Report the page pairs inspected and changed, any counterpart intentionally left unchanged after semantic comparison, any other exception, and the verification results.