feat: [CHA-2958] error hierarchy + wait_for_task#261

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feat/cha-2958-error-handling

Commits on May 28, 2026

feat: standardized error hierarchy + wait_for_task (CHA-2958)
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Commits on May 29, 2026

test: replace mocks in test_exceptions.py with real HTTP server + sockets
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docs(py): drop spec § refs and mechanism prose from error-handling docstrings
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