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2c449ca1f5
Collapse _compat_bridge to a single path that reads msg.content_blocks and emits protocol events. The translator / best-effort / tool_call_chunks extraction all live in content_blocks already — the legacy branch, _PROTOCOL_PASS_THROUGH_TYPES, _SELF_CONTAINED_BLOCK_TYPES skeleton handling, and manual reasoning-variant sniffing were duplicating work. Side fixes picked up along the way: - No-provider chunks with both text content and tool_call_chunks silently dropped the tool call because the legacy extractor put both at index 0. content_blocks places them on distinct indices. - "server_tool_call_result" (typo) replaced with "server_tool_result" in ChatModelStream's finish dispatch and the test that exercises it — matches the protocol type that every translator actually emits. Also collapses duplicated tool_call_chunk / server_tool_call_chunk handling in chat_model_stream into shared merge/sweep helpers so the two code paths can't drift apart again (which is how the typo survived). _compat_bridge.py: 855 -> 581 lines. No public API changes.