fix(tempo): preserve dispatched session vouchers

[parvahuja]

Why

A session voucher may reach the server even when the client never receives a response. Rolling back that voucher can make the client reuse an already-authorized cumulative amount and diverge from the server.

What

• Classify a credential fetch that throws after handoff as an unknown outcome.
• Stage session vouchers and commit them only when accepted or when delivery is unknown; discard them on known rejection or pre-dispatch abort.
• Keep SessionManager focused on durable channel checkpoints, with small regressions for active and resumed channels.

[pkg-pr-new]

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npm i https://pkg.pr.new/mppx@827

commit: 38e3bbd

[chatgpt-codex-connector]

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