agentHost: harden integration test timeouts

[roblourens]

Summary

• use extended protocol-operation and graceful-shutdown budgets on CI workers
• preserve fast timeout feedback for local macOS and Linux runs
• apply CI-aware waits to the protocol and Copilot customization suites affected by Azure build 461453

Why

The failed Linux worker was abnormally slow: its filesystem diagnostics took 4m14s, compared with 35s on a successful comparison worker. Fixed 5–10 second waits caused otherwise responsive tests to time out, and the 5-second shutdown budget could force-kill the Agent Host before persistence completed, cascading into later failures.

This change uses the existing normal/extended timeout policy for CI, as was already done for Windows and coverage runs, while retaining the shorter local budgets.

Validation

• npm run compile
• npm run hygiene
• affected Agent Host integration cluster: 6 consecutive CI-mode passes (42 passing, 2 pending)
• affected cluster with local timeout selection: 42 passing, 2 pending

The broader Agent Host integration run passed the affected tests but later encountered a separate Copilot idle-release assertion on current main.

(Written by Copilot)

[Copilot]

Pull request overview

Hardens Agent Host integration tests against slow CI workers while retaining shorter local timeouts.

Changes:

• Adds CI-aware protocol and shutdown timeout budgets.
• Extends affected protocol and Copilot customization test waits.
• Preserves existing local macOS/Linux timeout behavior.

Show a summary per file

File	Description
serverIntegrationTestHelpers.ts	Centralizes CI-aware operation, shutdown, and test timeouts.
copilotCustomizations.integrationTest.ts	Extends customization-suite CI budgets.
turnExecution.integrationTest.ts	Applies CI-aware turn test timeouts.
sessionLifecycle.integrationTest.ts	Applies CI-aware lifecycle test timeouts.
sessionDiffs.integrationTest.ts	Extends setup, test, and notification waits on CI.

Review details

• Files reviewed: 5/5 changed files
• Comments generated: 1
• Review effort level: Balanced