fix(codegen): complete follow-up fixes for #418

[wax911]

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Description

Fixes and follow-ups for #418.

This PR completes the #418 stream with focused runtime, plugin, publishing, and documentation updates:

• Runtime converter updates to support registry-only converter API usage paths.
• Gradle plugin wiring and functional coverage for compile, KSP, KAPT, and multi-target configurations.
• Standalone gradle-plugin local publishing flow plus published-consumer verification against mavenLocal.
• Delivery/build-context updates via .jitpack.yml, README, MIGRATION, AGENTS, and build dependency reference docs.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (Improve existing functionality)

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[codacy-production]

Not up to standards ⛔

🔴 Issues 13 medium · 16 minor

Alerts:
⚠ 29 issues (≤ 0 issues of at least minor severity)

Results:
29 new issues

Category	Results
Documentation	16 minor
Complexity	13 medium

View in Codacy

🟢 Metrics 65 complexity · 2 duplication

Metric	Results
Complexity	65
Duplication	2

View in Codacy

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[github-actions]

Auto approved automated PR