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bug: runtime-backed run-fuzz-suite advertises checkpoint reset without handlers #2321

Description

@chubes4

Problem

The standalone run-fuzz-suite --runner-mode=runtime-backed surface advertises wp-codebox.checkpoint-create and wp-codebox.checkpoint-restore in runner capabilities, but a suite using resetPolicy.mode: checkpoint-per-case fails every case with:

No Playground command handler is registered for: wp-codebox.checkpoint-create

Expected

The runtime-backed runner should either route reset operations through the runtime checkpoint primitives, as the recipe-backed wp-codebox/run-fuzz-suite path does, or stop advertising checkpoint reset support.

Reproduction

Run a wp-codebox/fuzz-suite/v1 suite with resetPolicy: { "mode": "checkpoint-per-case", "checkpointName": "baseline" } through:

wp-codebox run-fuzz-suite --input-file suite.json --format=json --runner-mode=runtime-backed

The result is status: error; each reset contains fuzz_suite_reset_execution_error with the missing-handler message above.

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