feat(cloud-sdk): Spring AI + LangChain4j auto-instrumentation + Spring Boot starter (Phase 1.8 + 1.9)

[sunilp]

Summary

Implements Phase 1.8 + 1.9 of the JamJet Cloud roadmap — drop-in observability for Spring AI and LangChain4j via:

• jamjet-cloud-sdk — JamjetObservationHandler (Spring AI Micrometer hook), JamjetChatModelListener (LangChain4j hook), Span.payload(...) for prompt/response capture, shared FailureModeClassifier.
• jamjet-cloud-spring-boot-starter (new module) — @AutoConfiguration gated on jamjet.cloud.api-key, registers both instrumentation beans, BPP that reflectively appends listener to ChatLanguageModel beans.
• Build — GPG signing + Sonatype publish moved to release profile so local mvn verify works without GPG pinentry.
• Docs — Apache 2.0 LICENSE + README install snippets.
• Version — bumped to 0.2.0, tagged v0.2.0.

Tests

23/23 passing on mvn verify:

• jamjet-cloud-sdk: 16 tests (5 existing + 1 Span.payload + 4 FailureModeClassifier + 3 ObservationHandler + 3 ChatModelListener + 1 LangChain4j WireMock E2E)
• jamjet-cloud-spring-boot-starter: 7 tests (4 AutoConfiguration + 3 BPP)

Deferred

• Spring AI E2E integration test (Spring AI 1.0.0 GA renamed spring-ai-openai-spring-boot-starter → spring-ai-starter-model-openai; needs separate test infra). Unit test (JamjetObservationHandlerTest) covers the handler contract; full E2E will be validated by the Phase 1.10 demo app.

Companion change

Cloud-side cost-calc fallback (so Java/Go/TS SDKs can omit cost_usd) — separate PR in jamjet-cloud repo.

Test plan

• CI green on mvn verify -B (no GPG required)
• Spot-check the LangChain4j WireMock test: mvn -pl jamjet-cloud-sdk test -B -Dtest=LangChain4jIntegrationTest
• Spot-check starter wiring: mvn -pl jamjet-cloud-spring-boot-starter test -B

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1598d1e9-3fe2-419f-bf6e-76ab96ba374c

📥 Commits

Reviewing files that changed from the base of the PR and between e930f94 and 395a7a3.

📒 Files selected for processing (27)

• LICENSE
• README.md
• jamjet-cloud-sdk/pom.xml
• jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/FailureModeClassifier.java
• jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/JamjetCloud.java
• jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/Span.java
• jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/instrumentation/langchain4j/JamjetChatModelListener.java
• jamjet-cloud-sdk/src/main/java/dev/jamjet/cloud/instrumentation/spring/JamjetObservationHandler.java
• jamjet-cloud-sdk/src/test/java/dev/jamjet/cloud/FailureModeClassifierTest.java
• jamjet-cloud-sdk/src/test/java/dev/jamjet/cloud/JamjetCloudTest.java
• jamjet-cloud-sdk/src/test/java/dev/jamjet/cloud/instrumentation/langchain4j/JamjetChatModelListenerTest.java
• jamjet-cloud-sdk/src/test/java/dev/jamjet/cloud/instrumentation/langchain4j/LangChain4jIntegrationTest.java
• jamjet-cloud-sdk/src/test/java/dev/jamjet/cloud/instrumentation/spring/JamjetObservationHandlerTest.java
• jamjet-cloud-spring-boot-starter/pom.xml
• jamjet-cloud-spring-boot-starter/src/main/java/dev/jamjet/cloud/spring/ChatModelListenerPostProcessor.java
• jamjet-cloud-spring-boot-starter/src/main/java/dev/jamjet/cloud/spring/JamjetCloudAutoConfiguration.java
• jamjet-cloud-spring-boot-starter/src/main/java/dev/jamjet/cloud/spring/JamjetCloudProperties.java
• jamjet-cloud-spring-boot-starter/src/main/resources/META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports
• jamjet-cloud-spring-boot-starter/src/test/java/dev/jamjet/cloud/spring/ChatModelListenerPostProcessorTest.java
• jamjet-cloud-spring-boot-starter/src/test/java/dev/jamjet/cloud/spring/JamjetCloudAutoConfigurationTest.java
• jamjet-runtime-core/pom.xml
• jamjet-runtime-instrument/pom.xml
• jamjet-runtime-plugins/pom.xml
• jamjet-runtime-protocols/pom.xml
• jamjet-runtime-server/pom.xml
• jamjet-spring-boot-starter/pom.xml
• pom.xml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/cloud-sdk-auto-instrumentation

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