Preserve user picker state for orchestration when Agent Merge is enabled

[Copilot]

Description

Agent Merge temporarily forces session config (for example mode=autopilot and elevated approvals) via controller-side injection, but orchestration tools were inheriting those temporary values when creating child sessions. This updates inheritance to use the underlying user-configured picker state instead of merge-induced overrides.

• Shared non-merge config view

  • Added getNonMergeSessionConfigValues(...) in agentMerge.ts.
  • When Agent Merge is enabled and injected config is present, it reconstructs effective user values from injectedConfiguration.previous (only for keys still matching injected applied values).

• Orchestration default inheritance fix

  • Updated AgentService._getServerToolCreationDefaults(...) to pass non-merge values into provider getInheritedChatConfig(...).
  • This makes create_session/orchestration inheritance copy pre-merge picker values, not temporary merge overrides.

• Coverage

  • Added unit tests for:
    • non-merge accessor behavior (merge-enabled and non-merge sessions),
    • session-creation inheritance from a merge-enabled source session (ensuring pre-merge values are inherited).

const config = provider.getInheritedChatConfig(
	getNonMergeSessionConfigValues(session.config?.values)
);

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