Phase 1: ADR-C — vindex provenance, consume only

[ttupper92618]

Parent: #173
Phase: 1 — Decisions + publisher smoke tier
Depends on: none
Blocks: #156, #158, #160, #171

Goal

Document vindex provenance and ownership.

Decision

Skulk consumes vindexes from HuggingFace (hf://...) and does not extract them in-tree. Extraction and publication live in a separate skulk-vindex-publisher repo that runs LARQL extraction/publish jobs on a schedule.

Rejected alternatives to capture:

• Extract inside Skulk: adds Rust/toolchain/runtime cost to every user machine.
• No catalogue: forces each user to discover or build vindexes manually.

Acceptance criteria

• ADR lands under docs/adr/ with status, context, decision, consequences, and rejected alternatives.
• ADR defines Skulk as vindex consumer only.
• ADR defines skulk-vindex-publisher as owner of extraction, publication, and catalogue governance.
• Model-store implications are linked to Phase 2: LarqlRunner — vindex pull + model-store integration #158.

Validation

• Documentation build or focused docs validation passes.
• No publisher implementation is included in this ADR-only issue.

[ttupper92618]

Implemented in PR #174: #174

This records the Phase 1 decision that Skulk consumes vindexes from Hugging Face as immutable provenance artifacts; extraction and publication live outside Skulk in the publisher repo.