feat(cli): wire puff bundle to compiler

[ofabiodev]

Summary

Connect puff bundle to the compiler pipeline so valid Puff projects generate real Minecraft datapacks.

Changes

• Generate datapacks using configured, default, or overridden output directories
• Forward --target and --output/-o options to the compiler
• Add coverage for successful builds, diagnostics, output preservation, missing configuration, and invalid arguments

Testing

make check
cd src
go test -count=1 ./...
go test -count=20 ./internal/cli
go build ./...