Reset buffered input before reconnecting - #177
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Problem: A closed session retained partial packet bytes in its input buffer. Reopening the same session could parse those stale bytes as the start of the new connection's first packet.
Fix: Reset the buffered input together with the packet length and protocol state during reconnect.
Regression coverage: Adds a focused upstream reconnect case with stale buffered bytes. Session tests: 79 runs / 211 assertions. Full suite: 434 runs / 1,198 assertions with only the pre-existing Ruby 4 StartTest positional-hash/keyword expectation failure.