# Phase 178.2 Context: Fresh First L1 To L2 Replay Receipt

## Why this phase exists

Phases `178` and `178.1` repaired the first fresh-topic L1->L2 follow-through
and proved it on an isolated acceptance lane, but the milestone still needs
one durable replay packet gathered under `.planning/` so the closure does not
depend on remembering which ad hoc command to rerun.

## Bounded goal

Package the repaired baseline as one durable replay receipt for milestone
closure:

- keep the raw isolated replay packet
- summarize the key state transitions in one human-readable receipt
- make the closure boundary explicit without widening to broader multi-lane
  claims
