Add LlmIntentClassifier and chat-to-proposal integration tests #713

Job	Run time
Dependency Review	4s
Workflow Lint	35s
OpenAPI Guardrail / OpenAPI Guardrail	38s
Backend Solution Regression	0s
Demo Director Smoke	0s
Dependency Security Signals	0s
E2E Smoke	0s
Load and Concurrency Harness	0s
	1m 17s

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