refactor(agents,prompt)!: uniform Java blocking API — rename, remove executor params

[EugeneTheDev]

Standardise the Java-facing blocking API across all modules so that:

• Every blocking wrapper follows the naming convention xxxBlocking (Kotlin) / xxx (Java, via @JvmName)
• Optional ExecutorService/Executor parameters are removed from all blocking wrappers; the agent's own configured dispatcher (strategyDispatcher / llmRequestDispatcher) is used instead
• Suspend counterparts in commonMain interfaces are annotated @JvmSynthetic to hide them from Java autocompletion

BREAKING:

• javaNonSuspendRun on AIAgent renamed to runBlocking; @JvmName("run") makes it run from Java
• javaNonSuspendInitialize / javaNonSuspendOnMessage on FeatureMessageProcessor renamed to initializeBlocking / onMessageBlocking
• All createAgent*, removeAgent*, agentById blocking overloads on AIAgentService renamed to *Blocking (Java callers see the original names via @JvmName)
• All blocking overloads on PromptExecutor and LLMClient renamed to executeBlocking, moderateBlocking, etc.
• ExecutorService/Executor parameter removed from every blocking wrapper listed above
• SubtaskBuilder.withExecutorService() builder method and executorService property removed
• NonSuspendAIAgentStrategy renamed to AIAgentStrategyBlocking; abstract method executeStrategy renamed to executeBlocking
• NonSuspendAIAgentFunctionalStrategy renamed to AIAgentFunctionalStrategyBlocking