"""Intern attendance monthly-report domain.

Pulls per-day attendance facts from Feishu (考勤, read-only), builds one
versioned report per intern per cycle, and drives a two-stage
confirmation workflow (intern → leader) with HR-orchestrated return /
resend and intern self-undo.

Layers:
    feishu_attendance  — read-only Feishu 考勤 client
    facts              — raw user_tasks → per-day snapshot + summary
    cycle              — 21→20 period arithmetic (local calendar dates)
    roster / config    — intern roster (dept membership) + tunables
    service            — cycle generation + report queries
    router             — HR endpoints
    constants          — states / events / Feishu enums (single source)

Cross-domain coordination (identity, notifications) goes through shared
core primitives, never direct domain imports.
"""