Rjf/omf csv mapping source

[robfitzgerald]

this PR introduces an alternative means to load an OvertureMaps Places mapping. these mappings can be quite long - there are over 2000 OvertureMaps categories total - and so expressing that directly within a bambam config file is noisy. this PR allows the user to alternatively define a CSV source for category mapping:

[plugin.output_plugins.model.models.opportunity_source.places_activity_mapping]
places_mapping_input_file = "mapping.csv"
places_category_column = "omf_label"
mep_category_column = "mep_labels"
mep_category_separator = "-"  # sep to use when more than one MEP label is produced

testing

1. unpack and copy these files into the base of the bambam repo:

omf-csv-test-assets.zip

overture-to-mep.csv
test_denver_omf.toml

2. run bambam:

% cargo build -r --manifest-path rust/Cargo.toml
% RUST_LOG=info ./rust/target/release/bambam -c test_denver_omf.toml -q query/denver_extent.json

3. a JSON and CSV output should appear with no errors logged to console or into the file contents, and the opportunities counted for each grid cell/mode/timebin come from OvertureMaps categories mapped to MEP categories as defined in teh overture-to-mep.csv file instance.

[admrtin]

@robfitzgerald after copying the files into my repo, checking out this branch, and running the build command and bambam command, I received the following error:

[2026-07-09T06:30:10Z ERROR routee_compass::app::cli::run] Could not build CompassApp from config file: failure running output plugin: failure running plugin: Error during overturemaps collection: Group Mapping operation Failed: Group services was not found in mapping
[2026-07-09T06:30:10Z ERROR bambam] failure running output plugin: failure running plugin: Error during overturemaps collection: Group Mapping operation Failed: Group services was not found in mapping

The error message comes from the reverse_map method on TaxonomyModel, in rust/bambam-omf/src/collection/taxonomy/taxonomy_model.rs

[admrtin]

Some errors were output due to the "service" omf group (see above). Don't know if this was expected.

[robfitzgerald]

these code changes appear as part of PR #159.