chore: release 0.12.5, begin 0.12.6.dev0 development

[bigsmartben]

Automated release of 0.12.5.

The git tag v0.12.5 has been pushed and the release artifacts are being built from that tag.

Merging this PR will set main to 0.12.6.dev0 so development installs are marked as pre-release.

Assisted-by: Codex (model: GPT-5, autonomous), acting on behalf of @bigsmartben.

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 81a4843486

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[chatgpt-codex-connector]

Preserve a taggable 0.12.5 release commit

When this release change is collapsed to a single tree, there is no commit in the reviewed history whose pyproject.toml version is 0.12.5; the final tree already says 0.12.6.dev0. The release trigger normally commits 0.12.5, tags that commit, then commits the dev bump, and the PyPI workflow checks out the tag and rejects it unless the tag version matches pyproject.toml. If v0.12.5 is placed on this reviewed commit, the publish job will fail with tag 0.12.5 versus package version 0.12.6.dev0, so keep/split the intermediate release-version commit or otherwise ensure the tag points at a tree with version = "0.12.5".

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