Use the knowledge partitons to make a NPM data package

[abkfenris]

Add js-data-pkg/ containing the standard_knowledge_data npm package —
a pure-JS companion to the WASM package that ships pre-generated IOOS
community knowledge and CF standard name partitions as tree-shakable
ESM modules.

Build script (js-data-pkg/scripts/build.mjs) reads core/standards/*.yaml
directly and emits gitignored ESM files:
all-standards.js — full CF vocabulary (~3.9 MB)
all-knowledge.js — CF subset + all 41 knowledge entries
partitions/{slug}.js — per-IOOS-category self-contained subsets

Package exports use wildcard subpath patterns so new categories are
picked up automatically without updating package.json:
import met from 'standard_knowledge_data/partitions/meteorology'

Add data_pkg_build nox session (off by default) and build_data_pkg CI
job that installs deps, runs the build, and smoke-tests the meteorology
partition before any publish step.

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This is part 5 of 6 in a stack made with GitButler:

•  6  Release artifacts #182
•  5  Use the knowledge partitons to make a NPM data package #181 👈
•  4  Generate partitions/subsets of knowledge split by ioos_category #180
•  3  WASM/JS external ingestion API #179
•  2  Feature gate for embedding data #178
•  1  JS build optimization #177

[github-actions]

Javascript size report

	Size
Base (phase-2c-partition-subset-generation)	462.3 KB
PR	462.3 KB
Delta	+0.0 KB (+0.0%)

✅ No size change.