v2.0.0a1

What's Changed

• Flip branching scheme: v2 on master, 1.x maintenance on v1.x by @jepegit in #502
• Decommission in-repo legacy summary engine (#385) by @jepegit in #503
• Drop redundant module-level header constants (#505) by @jepegit in #512
• Per-test metadata: TestMetaCollection on Data (#506) by @jepegit in #514
• Campaign merge: distinct test_ids + per-test windowing (#507) by @jepegit in #515
• Loaders emit per-test metadata, compact test_id, raw_units (#508) by @jepegit in #516
• Slim CellpyCell, exclude_step_types, top-level API (#509) by @jepegit in #517
• v9 cellpy-file format (zip-of-parquet) — #510 Milestone A by @jepegit in #521
• v9 meta archive helpers + campaign round-trip — #510 Milestone B by @jepegit in #522
• 510 v2 release discipline milestone c by @jepegit in #523
• Fix cellpycore 0.2.2 sync fallout: merger summary test_id + stale tests by @jepegit in #524
• Native schema opt-in: CellpyCell(native_schema=True) (#511, V2-11) by @jepegit in #525
• Campaign merge: support renumber_cycles=False (#529) by @jepegit in #531
• CI: add full (linux / uv) job as the intended required merge gate (#530) by @jepegit in #532
• Per-cell cellpy_units: stop sharing the module-level singleton (#427) by @jepegit in #533

Full Changelog: v1.1.0.post1...v2.0.0a1