wave 7: fuzz sidecar scaffold (fuzz/ workspace, shared crate, runner, dict, seeds skeleton)

fuzz/json.dict

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+# JSON tokens for the envelope framing targets (ADR-014 wire format).
+"call.requested"
+"call.responded"
+"call.completed"
+"call.aborted"
+"call.error"
+"call.published"
+"type"
+"id"
+"payload"
+"operationId"
+"input"
+"output"
+"code"
+"message"
+"retryable"
+"details"
+"NOT_FOUND"
+"INVALID_INPUT"
+"INTERNAL"
+"TIMEOUT"
+"FORBIDDEN"
+"CONNECTION_CLOSED"