Stabilize HTTP API startup and request handling

[eviltester]

Summary

• split Thingifier REST route configuration from Javalin startup so downstream apps can register hooks before the server starts
• serialize generated HTTP API entrypoints per Thingifier model to avoid immediate read-after-write visibility races across Jetty worker threads

Verification

• mvn -B -pl ercoremodel,thingifier -am install -DskipTests
• mvn -B -pl thingifier test
• full Maven verification from commit hook passed across all Thingifier modules

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-17T09:06:32.115086Z	15d8d44	PR opened

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 15d8d44e49

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[chatgpt-codex-connector]

Record the HTTP server only after startup succeeds

When JavalinHttpServer.start() throws, such as while the configured port is temporarily occupied, httpServer remains non-null. If the caller fixes the cause and retries startHttpServer(), the new guard returns without attempting to bind, leaving this MainImplementation permanently unable to start; assign the field only after a successful start or clear it on failure.

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