"""Slack post + alert Lambda: daily summary and batched 3rd-escalation alert.

Invoked after the classifier finishes. Reads ``analytics/dt=today/summary.json``
and the yesterday partition (for deltas), posts the daily summary to the WO
channel via the reused bot token (SSM, same pattern as payments-dashboard), and
— only if the 3rd-escalation count > 0 — posts the standalone batched alert.

Implemented in Phase 4 (docs/BUILD.md).
"""

from __future__ import annotations


def handler(event, context):
    """Lambda entry point. (Phase 4)"""
    raise NotImplementedError