feat: package skeleton — DESCRIPTION, NAMESPACE, session/manifest/cache/views

Minimal skeleton for uscogdata v0.1. Internal session layer with lazy cog_open(), manifest fetch+validate+cache, view registration placeholder. Depends on DuckDB >=1.0, httr2, jsonlite. inst/schemas/provenance-v1.json ships the structured provenance JSON Schema.
2026-04-23 09:05:54 -04:00
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+# R/cache.R
+# Local partition cache; SHA-based invalidation.
+# Phase N v0.1 implementation: DuckDB httpfs handles actual reads directly
+# from Nextcloud; cache_dir holds only manifest.json. Richer partition
+# caching (pre-fetch hot partitions) is a v0.2 feature.
+# Stub here for cog_mirror to compose against.