Addresses the follow-up review findings on the settlement-path fixes:
- send_done now routes both the pre-encoded VALUE frame and the dict ERROR
frame through a bound _encode_json_plain + bound write_encoded, never through
channel.send_sync (whose body re-resolves self.write_encoded and the module
_encode_json_plain at call time) — a program rebinding ProtocolChannel.
write_encoded or __main__._encode_json_plain no longer skips the done frame.
- flushStray retention re-accrues the withheld multibyte tail from a FRESH
utf8 state (previously metering the carried lead against the post-flush
expected>0 state charged it as an illegal continuation), and skips admitting
when the whole residual drained into the retained tail so no bogus empty
entry is pushed.
Chinesezjc
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