Add Laterality enum and region_coverage to ProjectionMeasurementMatrix

[reneyagmur]

Motivation

Projection matrices can be split into ipsilateral/contralateral by naming convention (e.g., wnm_exc_proj_ipsi), but laterality is not captured in the schema, making it unqueryable.

Similarly, determining which CCF regions a dataset has projection data in requires loading the full cells × regions matrix and checking for non-zero columns. This is a common cross-dataset query that should be precomputed.

Changes

schemas/base_schema.yaml

• New Laterality enum: IPSILATERAL, CONTRALATERAL, BILATERAL, UNKNOWN
• New laterality slot with range: Laterality

schemas/projection_schema.yaml

• laterality: required field on ProjectionMeasurementMatrix
• region_coverage: optional multivalued BrainRegion list on ProjectionMeasurementMatrix — precomputed subset of region_index where at least one data item has a non-zero value

src/connects_common_connectivity/models.py

• Regenerated via bash scripts/generate_models.sh

tests/test_basic.py

• test_laterality_enum — all four enum values exist
• test_projection_measurement_matrix_laterality — required enforcement, valid/invalid enum validation
• test_region_coverage_on_pmm — optional field, list type, subset of region_index

src/connects_common_connectivity/io/

• New module with io_plans.md specifying two planned utility functions:
  • populate_region_coverage(pmm, matrix) — auto-populate region_coverage from a dense values array
  • compare_region_coverage(pmms) — shared regions, shared coverage, and exclusive coverage across datasets
  • io utils will be a separate PR

.devcontainer/

• Added local Docker dev container config (CodeOcean setup unchanged)

environment/postInstall

• Added CCC package installation

Testing

9 tests pass (uv run pytest -q).

[danielsf]

Just some changes to the unit tests. Other than that, looks good.

[reneyagmur]

@danielsf ready for re-review