chore(main): release wren 0.13.4

[github-actions]

🤖 I have created a release beep boop

0.13.4 (2026-09-02)

Bug Fixes

• context: normalise model columns in load_models (#2614) (d48498f)
• context: reject v1 view upgrades that map two views to the same target (#2696) (992f1da)
• cube: load/validate like views; fail loud on mdl.json (#2668) (5cf36cd)
• memory: validate imported query pair field types (#2656) (2e87902)
• skills: wrap generate-mdl SKILL.md's relationships.yml example under the required key (#2676) (a8e8d04)
• wren: accept only read-only SELECT statements in the query path (#2679) (ce9513d)
• wren: connect with autocommit so a failed statement cannot poison the connection (#2683) (5e01777)
• wren: mark truncated values in the skipped-row report (#2675) (11184dc)
• wren: preserve wide MySQL and Doris decimals (#2657) (7ca6c77)
• wren: report a validation error for non-scalar model/view names (#2681) (56e007d)

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[github-actions]

🤖 Created releases:

• wren-v0.13.4

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