A complete, per-endpoint API reference

The reference section just got a major upgrade. Four product areas are now documented endpoint by
endpoint instead of as a single narrative walkthrough each:

• Farm Management — Farms, Fields, Seasons, Crops, Cultivations, Fertilization, and Boundaries.
• Precision Farming — Nitrogen Recommendation Map, Pre-season Nitrogen Recommendation, Soil
  Productivity Map, and both Vegetation Index products (map and profile).
• Sat-MRV — Areas of Interest, the full stratification workflow, saved maps, samples, and
  soil-property data.
• RegenScope3 — GHG assessments, their data sections, completeness checks, submission, and the
  impact report.

Every page now has a full request/response parameter table, every status code and exactly what
triggers it, and the edge cases that actually matter — duplicate-order behavior, region
restrictions, bulk-ordering limits, and more — instead of leaving them to be discovered by trial
and error.

We also gave the Reference section's introduction and the API Documentation Standards page a pass,
so both stay accurate as the reference keeps growing.

If you've been reverse-engineering behavior against these APIs, it's worth another look.