Balsa 0.2.1

Balsa 0.2.1

Native Mojo storage and editing for Treelite v4 checkpoints. Target: Linux
x86-64, Mojo/compiler 1.2.0 with MAX core 26.7.0. This release is a compiler
migration and the first version intended for the modular-community channel.
The public API, checkpoint bytes and packed defaults are unchanged from 0.2.0;
see the 0.2 migration guide for those contracts.

Compiler compatibility

Library version	Mojo compiler	MAX core	Source	Distribution
0.2.0 build 0	1.0.0	26.5.0	v0.2.0 (3547975)	CI artifact
0.2.0 build 1	1.0.0	26.5.0	ccd68c6 (Apache-2.0 licensing)	CI artifact
0.2.0 build 2	1.1.0	26.6.0	b32c4a3	CI artifact
0.2.1 build 0	1.2.0	26.7.0	v0.2.1	modular-community (pending review)

From 0.2.1 on, each compiler migration gets a new library version and tag. A
build number increment is reserved for recipe-only rebuilds of the same source.

Changes

• Following the Mojo 1.2.0 changelog,
  little-endian fast paths in wire and packed_views test
  Endian.native() == .little instead of the deprecated is_little_endian().
• Apache-2.0 licensing with separate Treelite license and attribution, carried
  over from 0.2.0 build 1. The v0.2.0 tag predates it; v0.2.1 includes it.
• rattler-build is pinned in the packaging environment. CI records
  SHA256SUMS and SOURCE_COMMIT with the Conda artifact, and v* tags
  create a draft GitHub release from the artifact CI tested.

Verification

Core, packed, defaults, ownership and framework tests pass, along with the
generated API reference check, byte-for-byte Treelite and trained-framework
fixture regeneration, and Treelite 4.6.1 interoperability. The Conda package
passes its isolated installation test without a source include path.

Release asset note

balsa-0.2.1-hb0f4dca_0.conda also contains an empty share/max/firstActivation
file that MAX writes at activation. The in-repo recipe lacked a build.files filter.
The file is unowned and harmless; the library is lib/mojo/balsa.mojoc. The
community-channel recipe and later in-repo builds install only the library.