…erage gaps

…minor doc/typing tightening

…d names

…e; orjson consistency

…test coverage

…verage

…sync: add run_start_timeout parity

When a lifecycle errored event arrives before the tool-call stream ends,
the finally block now waits up to 1 second for _run_done to settle, then
reads the terminal error and fails remaining handles with it. Without this,
handles received the generic "stream closed" message instead of the run
error. Mirrors _ToolCallsProjection in _async/stream.py.

Add test: test_sync_tool_calls_run_error_fails_active_handle
Add comprehensive sync projection tests (namespace filtering, multiple
messages, error events, multiple concurrent tool calls, tool-error event).

…ore yielding

Without pre-dispatch, callers accessing str(stream.text) immediately inside
a for loop would see empty text because only message-start was dispatched.
Add inner read-ahead loop matching the pattern in _SyncMessagesProjection.
Add test: test_sync_drain_messages_inbox_pre_dispatches_before_yield.

…r, fans out to all matching descendants

… fall back to single active stream only for unkeyed events