fix(session): handle context navigation errors

[DudaGod]

I turn failures in asynchronous browsing-context listeners into test-visible errors without leaving unhandled rejections. A missing context tree now produces an explicit error.

I retain every error per browser session and expose a test-boundary check that waits for pending listener work. A command settles before its promise rejects with a context error, so it cannot keep changing state after that rejection. A pending error does not block deleteSession cleanup. Multiple failures are preserved in an AggregateError.

The test-boundary check is consumed by testplane#1335. Until that PR is used, an active or subsequent command still fails on a context error.

Validation:

• Monorepo build passed.
• Focused session-manager tests: 14 passed.
• With both packages linked into a local Testplane project, the two affected tests failed with the explicit context error (including an error after the last command), and an unrelated worker passed. No unhandled rejection occurred.
• The full WebdriverIO unit suite is not green on the current Node 24 setup: 427 tests fail, predominantly with Cannot set property duplex of #<_Request> which has only a getter. The repository's ESLint hook could not run because its eslint binary is absent from the clean install.

[pkg-pr-new]

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commit: f3f916a