[zhongkechen]

Prepare the next major release on top of #737 (refactor/per-invocation-plugin-instances). The stack includes its per-invocation plugin factories, coordinated Core/OTel migration, version bumps and dependency updates.

Versions in the stack

Package	Version
Core SDK	3.0.0
OpenTelemetry	2.0.0
Extras	0.1.0
Testing	1.3.0

Core, OTel and Extras version changes are inherited from #737. Testing keeps the version published in the preceding minor release; its next version can be decided when the remaining release content is known.

Changes above #737

• Preserve the published Testing 1.3.0 version and SDK >=2.1.0 requirement from chore: prepare Python minor releases #764.
• Preserve the plugin conformance JSON-logging fix and regression coverage from fix(ci): use JSON logs for plugin conformance #792.
• Update the release compatibility check to describe the coordinated major release and verify that OTel also permits a later SDK 3.x minor version.

The two mainline commits above were merged after #737's last sync with main. Their patches are unchanged by the rebase. Overlapping version changes and compatibility checks already supplied by #737 are inherited from that PR.

Merge order and remaining scope

1. Merge refactor(plugin): create one plugin instance per invocation #737 first.
2. Retarget this PR to main and refresh the branch after that merge.
3. Finalize any additional release content, package versions and release notes before publication.

This PR remains a draft while the release scope is being assembled.

Validation

Validation on Python 3.13 with #737 at 8ed1fb83 and this branch at 24add8b6:

• 1,975 Core, metadata and conformance-template tests passed.
• Built Core 3.0.0 and OTel 2.0.0 wheels passed all 736 OTel tests and 12 factory lifecycle compatibility cases.
• The released-OTel rejection lane passed all four cases.
• Core/OTel wheel and source-distribution builds, Hatch lint/format checks, commit-message validation and git diff --check passed.
• git range-diff confirmed the two carried-forward mainline patches are unchanged.

Cloud and conformance runs are left to GitHub CI. Final release validation should include any further changes added to the stack.

[github-actions]

Codex AI review

No actionable findings. The added compatibility assertion matches the existing dependency range. Validation was limited to static inspection; tests were not run, per the review constraints.

Reviewed commit bd955be3889543878bc57e9184db20a03fd841e1. Workflow run