# Phase 66 Summary

Status: implemented on `main`

## Goal

Compile the first global Layer 0 source catalog so cross-topic source reuse is
no longer hidden inside separate topic-local source indexes.

## What Landed

- new compiler module:
  - `research/knowledge-hub/knowledge_hub/source_catalog.py`
- new CLI entrypoint:
  - `aitp compile-source-catalog`
- new extracted command-family handler:
  - `research/knowledge-hub/knowledge_hub/cli_source_catalog_handler.py`
- source catalog artifacts now materialize under:
  - `source-layer/compiled/source_catalog.json`
  - `source-layer/compiled/source_catalog.md`
- the compiled catalog now surfaces:
  - deduplicated `canonical_source_id` groups
  - cross-topic reuse counts
  - linked references between cataloged sources
  - source-type family summaries
  - topic-level source coverage summary

## Outcome

Phase `66` is complete.
The next active milestone step is Phase `67`
`citation-traversal-and-source-family-reuse`.
