[T3459] FIX: restore the missing </t> in the New Biennial template

[Danielgergely]

No description provided.

[greptile-apps]

Confidence Score: 5/5

Safe to merge: the migration preserves the JSONB translation mapping while applying the intended template repair.

What we checked:

• Confirmed the source value is stored as jsonb and that the replacement expression changes only the intended line-leading % endif markers.
• Executed the migration's parameterized update against an isolated PostgreSQL 16 JSONB table and confirmed after_type=jsonb, after_equals_expected=True, and RESULT=PASS.
• Saved the executable reproduction script and the before/after output for audit.
• Before capture confirms the source value is jsonb and the regex produces only the intended replacements.
• After capture executes the PR SQL and confirms after_type=jsonb, after_equals_expected=True, and RESULT=PASS.

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