SESSION_ABSOLUTE_HOURS (default 168 h) caps a session's total lifetime
from login: expiresAt is set once at creation and never extended — the
old sliding 30-day renewal is gone. SESSION_IDLE_HOURS (default 72 h)
ends sessions unused for that long, enforced server-side against
lastSeenAt with a write throttle scaled to the idle bound so short idle
windows still renew. Expired rows are removed on validation and the
session list applies both bounds, so idle-dead sessions never show as
active. The cookie maxAge follows the configured absolute bound.
Documented in .env.example (with the VS-NfD reference values for the
upcoming hardening guide #227), compose passes the variables through,
security.md and ADR 0007 record the amendment.
Refs #190
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0168Ph5uBmHm8X28CSVpbpnJ
