wboayue / rust-ibapi / 26003029493

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connection: typed StartupMessage variants for handshake replay; mark non_exhaustive

Adds typed Execution/CommissionReport/CompletedOrder + ExecutionDataEnd/
CompletedOrdersEnd variants to StartupMessage. Eliminates the need to
match Other(ResponseMessage) and dispatch by message_type() in callers
when connected as the Master Client ID (where TWS replays open-order +
commission-report history at handshake). Other(_) stays for now; PR 3
of plans/retire-response-message-public-surface.md removes it together
with the ResponseMessage public-surface narrowing.

Decoders (decode_execution_data / decode_commission_report /
decode_completed_order) already existed crate-private; narrow re-export
extended in orders/common/mod.rs. Decode-failure paths continue to fall
through to Other(message.clone()) — that fallback is replaced in PR 3
by a warn + notice_sink synthesized notice.

#[non_exhaustive] added so future typed variants do not break consumers.
Updated the two integration crate connection callsites from exhaustive
match to if-let.

Includes PR 1 deliverable: plans/retire-response-message-public-surface.md
plus examples/async/startup_capture.rs (live-capture diagnostic).

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