[GenAI] Add support for io.confluent:kafka-avro-serializer:8.2.1 using gpt-5.5

[jormundur00]

What does this PR do?

Fixes: #7009

This PR introduces tests and metadata for io.confluent:kafka-avro-serializer:8.2.1, enabling support for this library.

Summary:

• Strategy: dynamic_access_main_sources_pi_gpt-5.5
• Agent: pi
• Model: gpt-5.5
• Input tokens: 34149
• Cached input tokens: 345088
• Output tokens: 4375
• Metadata entries: 30
• Test-only metadata entries: 12
• Iterations: 1
• Library coverage percentage: 38.54
• Generated lines of code: 109
• Tested library lines of code: 227

Forge

• Forge monitored branch: master
• Forge branch: master
• Forge commit hash: 4ec0c5cee337e5abc03ab5ada2960e892d47b191

Stats from stats/<groupId>/<artifactId>/<metadata-version>/stats.json:

Dynamic access coverage:

• Overall: 3/3 covered calls (100.00%)
• Reflection: 3/3 covered calls (100.00%)

Library coverage:

• Instruction: 883/2481 (35.59%)
• Line: 227/589 (38.54%)
• Method: 40/120 (33.33%)

Local CI Verification

• Status: success
• Commands run: 2
• Fixup attempts: 0