Add PipelineWarning(PronoteSyncError) to the canonical error hierarchy. This non-blocking warning type is used by the XMPP channel (and future channels) to signal recoverable failures without breaking the pipeline. - PipelineWarning inherits from PronoteSyncError, not Warning builtin - Constructor: (message, step=None) with recoverable=True - 8 unit tests covering inheritance, raising, catching, attributes Co-authored-by: opencode/test-engineer <test-engineer@agents.invalid> Co-authored-by: opencode/coder <coder@agents.invalid>
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