v0.3.1

Fixed

• NCEI CAG response format flip. Upstream NCEI Climate at a Glance
  data.json (/access/monitoring/climate-at-a-glance/global/...) now
  wraps each year's value in an object envelope:

  old:  "1851": "-0.12"          (bare string)
  new:  "1851": {"departure": -0.12}   (nested-object form)
  

  deserialize_cag_series previously matched only the bare string /
  numeric forms, so every row dropped silently and the parser raised
  CAG: empty data series. As a result the polymarket-data
  climate-index ingester (#79) couldn't populate the ncei_cag
  series — gistemp + nsidc continued to work; the CAG cross-check did
  not. Detected 2026-05-19 via the climate-index startup log.

  The deserializer now tolerates BOTH forms: the legacy bare
  string/number stays accepted (so a future NCEI flip back doesn't
  re-break us), and the new {"departure": <num|str>} envelope is
  unwrapped. Any other inner keys (e.g. a future "rank" /
  "uncertainty") are ignored. Tests in
  tests/test_climate_index.cpp::ParsesCagDepartureObjectForm /
  ParsesCagDepartureStringInsideObject /
  RejectsCagObjectWithoutDeparture pin all three regimes.

v0.3.0

Added

• National-climate settlement feeds. ncei/models/climate_index.hpp
  with deserialize_cag_series (NCEI Climate at a Glance / NOAAGlobalTemp
  data.json — "hottest year rank"), deserialize_gistemp_csv (NASA
  GISTEMP GLB.Ts+dSST.csv cross-check), and
  deserialize_nsidc_sea_ice_csv (NSIDC Sea Ice Index v4 — "minimum
  Arctic sea-ice extent"). New MonitoringClient
  (get_cag_global_annual / get_gistemp_global /
  get_nsidc_arctic_extent). HttpClient now passes absolute URLs
  through unchanged so one client reaches all three hosts (ncei.noaa.gov,
  data.giss.nasa.gov, noaadata.apps.nsidc.org); relative CDO / Data
  Service paths are unaffected. Consumed by polymarket-data (Phase 3c).
• .editorconfig (fleet-standard: tabs, 4-width, LF, UTF-8, 100-col
  max for C++). Sibling to .clang-format; covers editors that don't
  read .clang-format (#12).
• make pre-commit + make install-hooks targets — auto-format + lint
  via git pre-commit hook (#8).

Changed

• README install snippet pinned to v0.2.0 (#9, #10).

Fixed

• LICENSE: copyright holder de-truncated (#11).

v0.2.0

Changed

• BREAKING: JSON parsing migrated from nlohmann/json v3.11.3 to
  Glaze v7.6.0. The public
  client API (CDOClient::get_*, DataServiceClient::get_*,
  parse_csv_data / parse_ssv_data) is unchanged. Internal
  from_json(const nlohmann::json&, T&) overloads have been replaced
  with deserialize_<T>(std::string_view, T&) -> Result<void> in the
  ncei:: namespace. The transitional json_string / json_int /
  json_double / json_bool helpers in models/common.hpp are gone
  (no external consumers). Benchmark: ~9-15x parse speedup on a
  representative 21 KB CDO /stations list-response payload
  (nlohmann ~360-590 us/op → Glaze ~32-40 us/op on x86_64-v3,
  GCC 13.3, -O3 -DNDEBUG).
• C++23 baseline reaffirmed — Glaze requires C++23 for its
  compile-time reflection path. CMakeLists.txt already enforced this.

Added

• tests/glaze_test.cpp — verifies parse-output shape parity with the
  pre-migration behavior (null-safety on every scalar field,
  unknown-key tolerance, dynamic DataPoint attribute preservation,
  CDO list-response envelope walking, snake_case ↔ camelCase
  JSON-key aliasing for datacoverage / mindate / maxdate /
  elevationUnit).
• tests/parse_benchmark.cpp — parse-throughput regression guard. Caps
  at 200 us/op (≈3x slower than the migration-time Glaze number) with
  a 30s ctest timeout.

Removed

• src/core/pagination.cpp (the nlohmann from_json overload for
  ResultSetMetadata). The CDO envelope is now parsed by a templated
  Glaze meta specialization in src/models/pagination_detail.hpp (an
  internal-only header).

v0.1.1

CI

• First-ever GitHub Actions workflow coverage — build + test + lint on
  Ubuntu 24.04, build-only on macos-latest, markdown-lint via
  DavidAnson/markdownlint-cli2-action
  (3031c1e).
• build-windows job added via vcpkg (parity with the rest of the SDK
  family).
• release.yml auto-creates a GitHub Release on vX.Y.Z tag push,
  with body sourced from this CHANGELOG via --notes-file so inline
  code spans survive
  (6831030,
  91f53ca).
• Tag/CMakeLists VERSION drift is caught at release time
  (67fa6de).
• actions/checkout@v6 upgrade for Node 24 runtime
  (71f41f1).
• .markdownlint-cli2.yaml config disables MD013 (line-length) and
  other style-noise rules; sibling repos share the same shape.
• MD004 (asterisk style) disabled for prose continuation parity
  (79abd8c).
• CLAUDE.md markdown reflowed to satisfy the new lint job
  (c4add51).
• cpp_auto_audit.py now walks --cached + --others so new test
  files don't pass local lint and fail CI
  (d681291).

Docs

• Add a Contributing section to the README
  (c2c15a1).
• Add CI / release / C++ standard / license badges to the top of the
  README (aad8888).
• Squash double-blank-line inserted by the Contributing section
  (898c594).
• Add this CHANGELOG.md + the auto-release-on-tag workflow it feeds
  (6831030).

Build

• Enforce explicit local cpp types (72ab089).

Chore

• Production-hardening .gitignore patterns mirrored from the rest of
  the SDK family
  (bca2e70).

Refactor

• Replace std::ostringstream with std::format / std::format_to
  throughout (91de476).

v0.1.0 - Initial Release

Added

• Initial release: C++23 NCEI Climate Data SDK
• Dual-client design:
  • CDOClient — token auth, 5 req/sec + 10K/day rate limit, offset
    pagination, 1-year date-range limit (auto-split via get_data_all)
  • DataServiceClient — no auth, multi-format (CSV / JSON / SSV),
    + URL-encoding for timezones
• Layered static libraries: ncei_core → ncei_http → ncei_models
  → ncei_cdo + ncei_data → ncei (INTERFACE)
• std::expected<T, Error> for all returns; ErrorCode::QuotaExceeded
  for CDO daily-quota exhaustion
• Auto-pagination + auto-date-splitting (transparent multi-year queries)
• Optional NetCDF support via NCEI_ENABLE_NETCDF build flag
• Endpoints: CDO (datasets, data_categories, data_types,
  location_categories, locations, stations, data) + Data Service
  (data, metadata)