Remove payer config option from transaction planner plugins

[lorisleiva]

This PR removes the Partial<ClientWithPayer> pattern from the transaction planner plugins. The payer must now be provided on the client (e.g. via a payer plugin) rather than passed as a config override, aligning with the composable plugin model.

[changeset-bot]

🦋 Changeset detected

Latest commit: a18d01f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@solana/kit-plugin-rpc	Minor
@solana/kit-plugin-litesvm	Minor
@solana/kit-client-rpc	Minor
@solana/kit-plugins	Minor
@solana/kit-client-litesvm	Minor

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[lorisleiva]

• Replace priorityFees with TransactionPlannerConfig in transaction planner plugins #193
• Remove payer config option from transaction planner plugins #192 👈 (View in Graphite)
• main

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[lorisleiva]

@trevor-cortex

[trevor-cortex]

Summary

Clean removal of the payer config option from both rpcTransactionPlanner and litesvmTransactionPlanner. The payer is now required on the client via ClientWithPayer (instead of Partial<ClientWithPayer>), enforced at the type level rather than at runtime. This aligns with the composable plugin model.

Notes

• Both plugins (litesvm and rpc) receive identical changes — good consistency.
• The generic constraint change from Partial<ClientWithPayer> to ClientWithPayer is the key enforcement mechanism — TypeScript will now catch missing payers at compile time.
• The runtime error path is removed entirely, which is the right call since the type system handles it now.
• Tests correctly shift from "throws at runtime" to @ts-expect-error + not.toThrow(), confirming the enforcement is purely at the type level.
• Changeset is properly marked as minor with breaking change documentation and a clear migration example.

LGTM 👍 — straightforward and well-scoped.