Cargo features

Compile-time capabilities and their dependency effects.

Feature	Default	Effect
`proj`	yes	Enables general CRS transformation through system `libproj`.
`mosaic`	yes	Enables `MosaicTiler`, `MosaicSource`, MosaicJSON, and async asset fan-out.
`webp`	no	Enables lossless WebP encoding through `image`.
`jpeg`	no	Enables JPEG encoding; alpha is flattened because JPEG has no alpha channel.
`stac`	no	Adds the STAC client and implies `mosaic`.
`perf-tracing`	no	Emits detailed internal timing events.
`tokio-console`	no	Enables Tokio Console integration and implies `perf-tracing`.

Examples:

# Default: projection + mosaics + PNG
cargo build --release

# Minimal library without general PROJ or mosaics
cargo build --release --no-default-features

# Example server with all image formats
cargo run --release --example serve --features webp,jpeg

# STAC-backed mosaic demo
cargo run --release --example serve --features stac

# Full verification surface
cargo test --all-features --locked

The serve, mosaic_source, and mosaic_json examples require the mosaic feature. PNG support is always compiled.