Fix AI(11) length for GS1-128 Production date barcode

[Copilot]

Description of the new Feature/Bugfix

AI(11) Production date in GS1-128 specification requires length 8 (2-digit AI + 6-digit YYMMDD), not 9. Changed Barcode128.java line 247:

// Before
ais.put(11, 9);

// After  
ais.put(11, 8);

This aligns with GS1 General Specifications (page 155) where AI(11) format is defined as YYMMDD.

Unit-Tests for the new Feature/Bugfix

• Unit-Tests added to reproduce the bug
• Unit-Tests added to the added feature

Compatibilities Issues

None. The previous value of 9 would have caused validation failures for correctly formatted AI(11) codes. This fix enables proper validation per specification.

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Testing details

Barcode128Test validates:

• Valid AI(11) with 6-digit date accepts: (11)240315
• Invalid AI(11) with 7-digit date rejects: (11)2403151
• AI(12) consistency check (also uses 8-character length)

The test exercises the validation logic at line 868 in setCode() which enforces the length constraint.

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud