Add fertilizer to input-cost tools (regional $/ton, USDA AgTransport)
input_cost_trend/input_cost_series now accept six fertilizers (urea, uan,
anhydrous, dap, map, potash) alongside diesel, with an optional `geo` region
(default Cornbelt). Real $/ton + MoM/YoY change + seasonal context.
- client: pass geo through; add input_cost_geographies
- server: expand VALID_INPUTS; geo param + docstrings
- format already unit-aware ($/ton) and geo-aware
- README tools table now lists the reference/trend + input-cost tools
- CHANGELOG: regional fertilizer input-cost release notes
- tests: fertilizer $/ton + region formatting
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
justin
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