chore: release v0.0.9

[modularmechanic]

Bumps the version to 0.0.9 and moves the Unreleased changelog entry under a dated 0.0.9 heading, following how v0.0.8 was cut.

The entry covers #22. One sentence was added to it before release: user modules saved on an earlier release keep loading, because the checker's new rules apply to new definitions and to a module when it is saved again, not to work read back from storage or an export.

Every defect listed under Fixed was re-checked against the v0.0.8 tag, so none of them describes a bug that only existed on the pre-squash line.

[coderabbitai]

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