RLS: setup for v0.13.0

[mmcky]

Release setup for v0.13.0: bumps __version__, adds the CHANGELOG pointer, and sets version/date-released in CITATION.cff, mirroring #973.

Release contents since v0.12.0: #953 (breaking: requests demoted to the notebooks extra, fetch_nb_dependencies deprecated), #978 (NFGReader/NFGWriter), #979 (PolymatrixGame rename with deprecated aliases), #955 (draw size dispatch, behaviour change for numpy-integer sizes), #971 and #974.

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[Copilot]

🟡 Changes recommended

Although the three files are internally consistent and correct, this is a release-tagging change to main that is kept releasable at any tag, so final human sign-off on release timing and content is warranted.

0 open findings

What changed in this PR

This PR sets up the v0.13.0 release by updating the three version-carrying files, mirroring the established pattern from #973 (the v0.12.0 setup). It bumps the package version, records the release snapshot for citation tooling, and adds a CHANGELOG pointer to the GitHub release notes. The version string in pyproject.toml is dynamic (read from __version__), so no other files require updates.

Changes:

• Bump __version__ from 0.12.0 to 0.13.0 in quantecon/__init__.py.
• Set version: 0.13.0 and date-released: 2026-10-08 in CITATION.cff.
• Add a Ver 0.13.0 (8th-October-2026) pointer entry to CHANGELOG.md.

File	Description
quantecon/​__init__.py	Bumps the canonical __version__ to 0.13.0, which pyproject.toml consumes dynamically.
CITATION.cff	Updates version and date-released so citation exporters pick up the v0.13.0 snapshot.
CHANGELOG.md	Adds the v0.13.0 entry pointing to the GitHub release notes, consistent with prior entries.

🧠 Review effort: Balanced

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[mmcky]

@oyamad I will plan to merge this later this afternoon and make the release.

[coveralls]

coverage: 94.088%. remained the same — rls/v0.13.0 into main