v0.5.0 — first-class point time-series

First-class point time-series (CMEMS + CDS)

A point is now a degenerate area: the same tools that subset a region also extract a time-series at a single location, so there is nothing new to learn.

Copernicus Marine (CMEMS)

• marine_subset_dataset accepts a single lat/lon point (equal min/max bounds) and returns the full time-series there. The toolbox selects the time-chunked ARCO store automatically, so a multi-decade point series downloads in seconds rather than minutes.
• Opt-in CSV output (file_format: "csv") for single-point requests; NetCDF remains the default.
• Optional minimum_depth / maximum_depth selection.
• Date-only and timezone-naive timestamps are accepted and interpreted as UTC.
• marine_search_datasets gains a service_types filter.

Climate Data Store family (CDS / ADS / EWDS)

• Time-series datasets accept a nested location: {latitude, longitude} input, surfaced by cds_describe_dataset.
• CSV output descriptors for time-series products.

Fix

• Subset size estimation now gates on the output file size, not the volume of data read — a small point-series download is no longer blocked by the large-transfer confirmation gate.

See the README and docs/ for installation and usage.