Remove dead Phylotypes.jl; preserved in PhyloEcology.jl

src/Phylotypes.jl was never included in the module (it depends on a Phylo
package that isn't a dependency and does not load). Its code now lives in a
separate glue package, PhyloEcology.jl, to be developed there. Drop the
now-unnecessary codecov ignore for it.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: mkborregaard

codecov.yml

@@ -9,8 +9,3 @@ coverage:
     patch:
       default:
         informational: true
-
-# Phylotypes.jl is not part of the loaded module (it depends on a `Phylo`
-# package that is not a dependency) and would otherwise be reported as 0%.
-ignore:
-  - "src/Phylotypes.jl"