New spread-fuel representation: dom/sec/other AGB + treedWetland_agb

[eliotmcintire]

fireSenseCovariatesCreate() (R/fuelClassPrep.R:620) always built one covariate column per fuel class, and the treedWetland indicator (R/fuelClassPrep.R:748) was only ever 0/1, never AGB. A new fuelCovariates = "domSecOther" option collapses the per-species columns into four AGB terms per ELF: dom_agb_<class> and sec_agb_<class> (the two classes with the most total treed AGB), other_agb (the rest, pooled), and treedWetland_agb (all tree AGB on treed-wetland pixels, taken out of the other three there). A new chooseDomSecFuelClasses() picks the dominant/secondary classes once per ELF, and fireSenseCovariatesCreate(domClass=, secClass=) lets a prediction force those same classes instead of re-deriving them from its own area. The default stays fuelCovariates = "species", so existing callers are unaffected.

Verified with devtools::load_all() + testthat::test_dir(): 808 tests pass on fix/hillSlope1-fixed-at-1 (base), 843 pass on this branch (0 failures either way); the 35 new expectations in test-domSecOtherFuels.R fail on the base with "unused arguments"/"could not find function" and pass here. R CMD check --no-tests is clean (0 errors, 0 warnings, 0 notes). Version bumped to 0.2.3.9050.

This stacks on #92 and #93 (hillSlope1), base fix/hillSlope1-fixed-at-1. fireSense_dataPrepFit/fireSense_dataPrepPredict will floor on this version.

🤖 Generated with Claude Code

https://claude.ai/code/session_01CwcjqqK59FmTJscyi7xUqv

[codecov]

Codecov Report

❌ Patch coverage is 90.62500% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.17%. Comparing base (8d9ba2c) to head (2f33005).
⚠️ Report is 1 commits behind head on development.

Files with missing lines	Patch %	Lines
R/fuelClassPrep.R	90.62%	6 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           development      #98      +/-   ##
===============================================
+ Coverage        68.84%   69.17%   +0.33%     
===============================================
  Files               40       40              
  Lines             3588     3650      +62     
===============================================
+ Hits              2470     2525      +55     
- Misses            1118     1125       +7     

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