[Epic] Rename wikidata-json-filter → wikidata-cache

[jakebromberg]

Overview

Rename this repository from wikidata-json-filter to wikidata-cache to match the naming pattern established by musicbrainz-cache. The current name describes the implementation (it filters Wikidata JSON dumps); the new name describes the artifact (a WXYC-filtered Wikidata cache PostgreSQL database).

Why

• Today the three caches are named inconsistently: musicbrainz-cache (artifact-named), discogs-etl + discogs-xml-converter (split repos), wikidata-json-filter (implementation-named).
• The PG database produced by this tool is referred to as "wikidata-cache" everywhere — see wxyc_etl::schema::wikidata, semantic-index/wikidata_client.py, library-metadata-lookup/scripts/entity_resolution/wikidata.py. The repo name is the only place it's called "wikidata-json-filter".
• Cleaning up before substrate publish (#rec5) and monorepo (#rec10) avoids dragging the old name into permanent locations.

Scope

In scope:

• Rename the repo on GitHub (auto-redirects old URLs).
• Update Cargo.toml package name + binary name (wikidata-cache).
• Update README.md, CLAUDE.md, all internal references.
• Update consumers: semantic-index (Cargo + Python references), library-metadata-lookup, discogs-etl, the org-level CLAUDE.md.
• Update CI/CD: GitHub Actions workflows, Docker images, any deploy targets.
• Update the wxyc-etl shared crate's schema constants if they reference the old name.

Out of scope:

• CLI standardization (handled by #rec2 — depends on this rename landing).
• Schema or behavioral changes to the tool itself.

Deliverables

• Repo renamed on GitHub
• All internal name references updated
• All consumer repos updated (one PR each)
• CI green across all updated repos
• Old name redirects work (verify via gh repo view WXYC/wikidata-json-filter)

Acceptance criteria

• cargo run --bin wikidata-cache works in the renamed repo.
• git clone git@github.com:WXYC/wikidata-json-filter.git continues to clone (via redirect).
• No broken references in any other repo's CLAUDE.md, code, CI, or deploy config.

Child issues

• Repo rename (single op; not orchestrator-eligible — coordination-heavy)
• Per-consumer reference update (each orchestrator-eligible)

Blocks

• #rec2 (CLI standardization) so wikidata-cache migration targets the renamed repo

Tracking

• Project: Music Data Pipeline Hardening
• Phase: A