fix(tempo): preserve dispatched session vouchers

[parvahuja]

Why

A session manager rolled cumulative authorization backward when a paid request threw after dispatch, even though the server could already have accepted that signed voucher. An idempotent retry without a receipt then left close unable to reconcile the server snapshot.

What

• Capture the exact active or resumed voucher state handed to a non-aborted fetch.
• Preserve monotonic authorization only for ambiguous post-dispatch failures; keep rollback for pre-dispatch, already-aborted, and known rejection failures.
• Cover active and resumed channels, receiptless idempotent recovery, and the snapshot-driven HTTP retry path.

[pkg-pr-new]

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

commit: 17e0ec1

[chatgpt-codex-connector]

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