vedic-calculator: 吠陀占星排盘引擎

Language contract / 语言契约

Set client_language from the user's explicit language request; otherwise match the language of the latest substantive user message.
Use client_language for all chat replies, intake questions, confirmations, progress updates, user-visible warnings, reports, and Q&A. Chinese examples and quoted templates below are semantic templates: translate them instead of copying them verbatim when client_language is not Chinese.
Keep canonical filenames, CLI flags, JSON keys, structured_data.md schema headings, technical codes, and Sanskrit/English identifiers unchanged. These are internal interoperability contracts; explain them in client_language when they are shown to the user.
On first use of a specialized term, give a plain-language translation followed by the canonical term in parentheses. Never translate canonical identifiers inside calculations or evidence citations.
If the user changes language mid-run, preserve the existing data and artifact lineage; switch client-facing language from that point onward unless the user explicitly asks to regenerate earlier artifacts.
When client_language is Japanese, read resources/ja-calculator.md completely before the first Japanese client-facing message. Apply it only as a terminology, register, intake, and rendering layer; it never changes calculations, schemas, evidence, phases, or output requirements.

基于pysweph天文引擎 + PyJHora精确算法，直接从出生时间计算完整星盘数据。输出格式完全兼容vedic-reader的structured_data.md，可直接交给vedic-core分析。