Add unit tests for brain and observable structures

[brandonkindred]

Motivation

• Add unit tests to improve coverage for core utilities used by the brain and observable data structures.
• Verify deterministic behavior for action lists, feature-vector loading, queue/hash mutation semantics, and node graph bookkeeping.

Description

• Added tests for ActionFactory (src/test/java/com/qanairy/brain/ActionFactoryTests.java) to lock down the expected ordered action set returned by getActions().
• Added tests for FeatureVector.load(...) (src/test/java/com/qanairy/brain/FeatureVectorTests.java) to validate matching, non-matching, and empty-input behavior.
• Added tests for ObservableQueue (src/test/java/com/qanairy/observableStructs/ObservableQueueTests.java) covering queue operations and observer notifications on mutating operations.
• Added tests for ObservableHash and ConcurrentNode (src/test/java/com/qanairy/observableStructs/ObservableHashTests.java, src/test/java/com/qanairy/observableStructs/ConcurrentNodeTests.java) covering put(...) semantics, getRandomKey(), constructor / accessor behavior, and observer notification on graph updates.

Testing

• Ran mvn test -q, which failed due to environment artifact resolution problems (failed to download org.springframework.boot:spring-boot-maven-plugin:2.2.6.RELEASE from Maven Central; HTTP 403), so the test suite could not be executed in this environment.
• No other automated test runs completed successfully because of the Maven plugin resolution error.

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