Changes in version 0.1.0                        

Initial release.

  - duckspending_connection() opens a DuckDB connection over the
    USAspending DuckLake archive at
    https://usaspending.grant-witness.us. Defaults to the latest
    snapshot; pass snapshots = "YYYYMMDD" to pin to a historical
    snapshot, or snapshots = "all" to attach every published snapshot at
    once and expose them as date-named schemas. The package caches both
    the connection and the catalog file per session for sub-millisecond
    repeat calls.
  - duckspending_snapshots() and duckspending_latest() discover
    available snapshots from a manifest on the archive (1 h disk cache).
  - duckspending_tbl(name, snapshot, conn) returns a lazy dplyr
    reference to any user-facing table. Convenience accessors for the
    headline tables: duckspending_subawards(),
    duckspending_assistance_transactions(),
    duckspending_procurement_transactions(), duckspending_agencies(),
    duckspending_recipients().
  - duckspending_attach() / duckspending_detach() /
    duckspending_attached() manage extra snapshots on an open connection
    at runtime. Defensive argument-order check catches the common (conn,
    snapshot) swap with a clean error.
  - duckspending_describe() lists tables and columns across attached
    snapshots; the description column auto-populates from
    duckspending_descriptions() (per-session ETag/Last-Modified cache).
  - duckspending_view() and connection_view.duckspending_connection()
    integrate with the RStudio / Positron Connections pane. The pane
    preview pins wide partitioned tables to a single Parquet file at
    plan time so previewing source_procurement_transaction is <1 s over
    the network instead of ~130 s. DuckLake metadata tables (leaf names
    starting with _ or ducklake_) are hidden in the pane but remain
    visible via DBI::dbListObjects().
  - Cached-catalog data path is rewritten in place to the absolute R2
    URL on first attach; the probe opens the catalog read-only so
    concurrent R sessions don't fight over a writer lock.
  - Vignettes: getting-started, cross-snapshot, sql-escape-hatch.
  - R CMD check passes 0 errors / 0 warnings / 0 notes.