fix(agent): avoid concurent restart lead to an empty schema sending

[arnaud-moncel]

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Note

Fix concurrent Agent.restart calls sending an empty schema

• Adds an isRestarting boolean guard to Agent that prevents overlapping restart calls, logging a debug message and returning early when a restart is already in progress.
• The guard is reset in a try/finally block so it clears correctly even if the rebuild throws.
• New tests in agent.test.ts cover single rebuild on concurrent calls, recovery after completion, and info logging on accepted restarts.

^{Macroscope summarized d858470.}

[qltysh]

Coverage Impact

This PR will not change total coverage.

Modified Files with Diff Coverage (1)

Rating	File	% Diff	Uncovered Line #s
	packages/agent/src/agent.ts	100.0%
	Total	100.0%

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