Release v0.6.0

[natangqm]

Summary

Prepares the v0.6.0 release.

• Bump version to 0.6.0 in pyproject.toml
• Promote the [Unreleased] changelog section to [v0.6.0] (empty [Unreleased] retained on top, matching the prior release convention)
• Fix the release build: bump reusable-build.yaml Python from 3.9 → 3.12

Missing changelog entries added

Audited all PRs merged since the v0.5.0 changelog (ffa137e). The existing [Unreleased] section already covered #218 (__package_versions__), #211 (lo_mode), #210 (pulse deprecations + qualang-tools removal), and #209 (qualibrate save fix). The following were missing and have been added:

• Added — support for Python 3.13 and 3.14 (Feature/support python 313 #214, Add support for Python 3.14 #219)
• Removed — support for Python 3.9 (Feature/support python 313 #214)

PRs that are CI/test/docs-only and do not warrant changelog entries (consistent with existing changelog style): #215, #216, #212, #207.

Release build fix

reusable-build.yaml (used by both the draft-release and PyPI-publish workflows) pinned setup-python to 3.9, but requires-python has been >=3.10 since #214 dropped 3.9. pip install -e .[build] would abort on 3.9, breaking the release pipeline. Bumped to 3.12; the wheel is py3-none-any so the artifact is equivalent on any supported version.

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[natangqm]

Superseded by #221 (same changes on the release/0.6.0 branch).