# Phase 47 Summary

Status: implemented on `main`

## Goal

Restore the real research loop with durable `L3` decomposition, explicit
`L4 -> L0/L1/L3` backedges, negative-result durability, and human-readable
runtime surfaces.

## What Landed

- rebuilt topic-loop support and runtime protocol surfaces
- explicit `L3`/`L4` state handoff and return-path behavior
- durable negative-result handling in production paths
- CLI/runtime surfaces expose the rebuilt loop behavior

## Outcome

Phase `47` is complete.
The next archived phase is `48` `source-fidelity-and-analytical-validation`.
