regional/groups.json: rich group -> tiles skeleton (match Perch v2)

docs: order regional catalog by groups.json to match Perch v2 README layout

Update catalog metadata for tropical Africa tiles (west/central/east-africa)

Add east-africa regional tile (BirdNET v3.0 slice, tropical Africa mainland)

Add central-africa regional tile (BirdNET v3.0 slice, tropical Africa mainland)

Add west-africa regional tile (BirdNET v3.0 slice, tropical Africa mainland)

Add canada-alaska to region table

Update catalog manifests for canada-alaska tile

Add canada-alaska regional tile (boreal+arctic North America)

Publish regions.json + migrate tile countries to ISO 3166-1 alpha-2; models.json schema v2 (family_meta + per-entry requirements)

SHA256SUMS: versioned filenames

card: versioned filenames + models.json

add models.json: machine-readable index with backend support, input contract and checksums

rename to versioned scheme (v3.0-preview3.1, build b1) [4]

rename to versioned scheme (v3.0-preview3.1, build b1) [3]

rename to versioned scheme (v3.0-preview3.1, build b1) [2]

rename to versioned scheme (v3.0-preview3.1, build b1) [1]

card: correct fp16 and regional-slicing claims; add measured benchmarks

card: correct fp16 and regional-slicing claims; add measured benchmarks

Add files using upload-large-folder tool

Add files using upload-large-folder tool

Add files using upload-large-folder tool

Add files using upload-large-folder tool

Add files using upload-large-folder tool

Add files using upload-large-folder tool

initial commit