[04] DuckDB read layer + Parquet publish for /v3 - #22
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Content-address each table object under the v2/ prefix the reference-aware
GC already scans (v2/parquet/{year}/{table}.parquet.{digest}, immutable) and
record it in manifest.blobs under a parquet/ logical key. The manifest is
written last, so a reader resolving the set through it never joins tables from
different runs. Content-gate against the manifest digest keeps steady-state
uploads at zero.
The DuckDB read layer resolves the whole set from one manifest fetch per sync,
materializes the referenced objects into a per-generation cache dir (reusing
unchanged objects by hardlink), and swaps the active dir atomically; each query
captures the base dir once so it never spans two generations.
…ad failure A3: the current-year cycle now writes the manifest exactly once, last, carrying both site-blob and parquet entries, so DuckDB and the frontend never disagree by a cycle and a crash between two writes cannot strand the API. A1: parquet no longer does read-modify-write with 'read_manifest() or Manifest()' on the hot path; the historical standalone writer aborts (logs + skips) when the manifest is unreadable instead of fabricating an empty one that erases every site-blob ref.
A2: _teams_source falls back to a glob (which _query turns into an empty result) instead of crashing on max([]), so /v3/team and /v3/teams return empty rather than 500 on a first db-less deploy before the first pipeline cycle.
chondl
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Replacement for #10 (auto-closed by branch rename). Part of the cph-staging series.